Extensive! Quotes from Timothy Keller ("The Reason for God" author)

“All change comes from deepening your understanding of the salvation of Christ and living out the changes that understanding creates in your heart.”

Christianity

 “When we look at the whole scope of this story line, we see clearly that Christianity is not only about getting one’s individual sins forgiven so we can go to heaven. That is an important means of God’s salvation, but not the final end or purpose of it. The purpose of Jesus’s coming is to put the whole world right, to renew and restore the creation, not to escape it. It is not just to bring personal forgiveness and peace, but also justice and shalom to the world. God created both the body and soul, and the resurrection of Jesus shows that he is going to redeem both body and soul. The work of the Spirit of God is not only to save souls but also to care and cultivate the face of the earth, the material world.”  (The Reason for God: Belief in an Age of Scepticism)
 
Evidence
“In the christian view, the ultimate evidence for the existence of God is Jesus Christ. If there is a God, we characters in his play have to hope that he put some information about himself in the play. But Christians believe he did more than give us information. He wrote himself into the play as the main character in history, when Jesus was born in a manger and rose from the dead.” (Reason for God) 

“If your fundamental is a man dying on the cross for his enemies, if the very heart of your self-image and your religion is a man praying for his enemies as he died for them, sacrificing for them, loving them - if that sinks into your heart of hearts, it's going to produce the kind of life that the early Christians produced. The most inclusive possible life out of the most exclusive possible claim - and that is this is the truth. But what is the truth? The truth is a God become weak, loving and dying for the people who opposed him, dying forgiving them.” 

“Any person who only sticks with Christianity as long as things are going his or her way, is a stranger to the cross” 

Salvation
“God's salvation does not come in response to a changed life. A changed life comes in response to the salvation, offered as a free gift.” 

“If you try to add to God's salvation you subtract. If you try to add to God's salvation you subtract. If you try to merit God's salvation you haven't believed at all, even if you try to do a little bit.” 

Jesus
“As many have learned and later taught, you don't realize Jesus is all you need until Jesus is all you have.”

“If Jesus rose from the dead, then you have to accept all that he said; if he didn't rise from the dead, then why worry about any of what he said? The issue on which everything hangs is not whether or not you like his teaching but whether or not he rose from the dead.” 

“The basic premise of religion– that if you live a good life, things will go well for you– is wrong. Jesus was the most morally upright person who ever lived, yet He had a life filled with the experience of poverty, rejection, injustice, and even torture.” 

Jesus' Miracles
“Christ's miracles were not the suspension of the natural order but the restoration of the natural order. They were a reminder of what once was prior to the fall and a preview of what will eventually be a universal reality once again--a world of peace and justice,
without death, disease, or conflict.” 

“We modern people think of miracles as the suspension of the natural order, but Jesus meant them to be the restoration of the natural order. The Bible tells us that God did not originally make the world to have disease, hunger, and death in it. Jesus has come to redeem where it is wrong and heal the world where it is broken. His miracles are not just proofs that he has power but also wonderful foretastes of what he is going to do with that power. Jesus' miracles are not just a challenge to our minds, but a promise to our hearts, that the world we all want is coming.” 

The Church
“Jesus's teaching consistently attracted the irreligious while offending the Bible-believing, religious people of his day. However, in the main, our churches today do not have this effect. The kind of outsiders Jesus attracted are not attracted to contemporary churches, even our most avant-garde ones. We tend to draw conservative, buttoned-down, moralistic people. The licentious and liberated or the broken and marginal avoid church. That can only mean one thing. If the preaching of our ministers and the practice of our parishioners do not have the same effect on people that Jesus had, then we must not be declaring the same message that Jesus did.”

“The church is a hospital for sinners, not a museum for saints.” 

Doubts
“Believers should acknowledge and wrestle with doubts... It is no longer sufficient to hold beliefs just because you inherited them.” 

“A faith without some doubts is like a human body with no antobodies in it. People who blithely go through life too busy or indifferent to ask the hard questions about why they believe as they do will find themselves defenseless against either the experience of tragedy or the probing questions of a smart skeptic. A person's faith can collapse almost overnight if she failed over the years to listen patiently to her own doubts, which should only be discarded after long reflection.”

Grace, Forgiveness, Justice

“Fear-based repentance makes us hate ourselves. Joy-based repentance makes us hate the sin.”

“If you want God's grace, all you need is need, all you need is nothing. But that kind of spiritual humility is hard to muster. We come to God saying, "Look at all I've done," or maybe "Look at all I've suffered." God, however, wants us to look to him - to just wash.” 

“For indeed, grace is the key to it all. It is not our lavish good deeds that procure salvation, but God's lavish love and mercy. That is why the poor are as acceptable before God as the rich. It is the generosity of God, the freeness of his salvation, that lays the foundation for the society of justice for all. Even in the seemingly boring rules and regulations of tabernacle rituals, we see that God cares about the poor, that his laws make provision for the disadvantaged. God's concern for justice permeated every part of Israel's life. It should also permeate our lives.”

  “...We must say to ourselves something like this: 'Well, when Jesus looked down from the cross, he didn't think "I am giving myself to you because you are so attractive to me." No, he was in agony, and he looked down at us - denying him, abandoning him, and betraying him - and in the greatest act of love in history, he STAYED. He said, "Father, forgive them, they don't know what they are doing." He loved us, not because we were lovely to him, but to make us lovely.

“We instinctively tend to limit for whom we exert ourselves. We do it for people like us, and for people whom we like. Jesus will have none of that. By depicting a Samaritan helping a Jew, Jesus could not have found a more forceful way to say that anyone at all in need - regardless of race, politics, class, and religion - is your neighbour. Not everyone is your brother or sister in faith, but everyone is your neighbour, and you must love your neighbour.” 

“If you have money, power, and status today, it is due to the century and place in which you were born, to your talents and capacities and health, none of which you earned. In short, all your resources are in the end the gift of God.” 

“God's grace and forgiveness, while free to the recipient, are always costly for the giver.... From the earliest parts of the Bible, it was understood that God could not forgive without sacrifice. No one who is seriously wronged can "just forgive" the perpetrator.... But when you forgive, that means you absorb the loss and the debt. You bear it yourself. All forgiveness, then, is costly.” 

“Mercy and forgiveness must be free and unmerited to the wrongdoer. If the wrongdoer has to do something to merit it, then it isn't mercy, but forgiveness always comes at a cost to the one granting the forgiveness.” 

“In Ephesians 5, Paul shows us that even on earth Jesus did not use his power to oppress us but sacrificed everything to bring us into union with him. And this takes us beyond the philosophical to the personal and the practical. If God had the gospel of Jesus's salvation in mind when he established marriage, then marriage only 'works' to the degree that approximates the pattern of God's self-giving love in Christ.”

Sin

 “The gospel of justifying faith means that while Christians are, in themselves still sinful and sinning, yet in Christ, in God’s sight, they are accepted and righteous. So we can say that we are more wicked than we ever dared believe, but more loved and accepted in Christ than we ever dared hope — at the very same time. This creates a radical new dynamic for personal growth. It means that the more you see your own flaws and sins, the more precious, electrifying, and amazing God’s grace appears to you. But on the other hand, the more aware you are of God’s grace and acceptance in Christ, the more able you are to drop your denials and self-defenses and admit the true dimensions and character of your sin.” 

“If you know what He has done at infinite cost to himself—He’s put you into a relationship so that you’ll never be rejected by Him—then your motivation when you sin is to go get Him. You want fellowship with Him. When the thing that most assures you is the thing that most convicts you, you’ll be okay because when you’re convicted of sin in a gospel way it drives you toward God.

Without the gospel we hate ourselves instead of our sin. Without the gospel we’re motivated through all sorts of awful fear and pride to change and it doesn’t really change our hearts; it just restrains our hearts.” 
 
“If you know what He has done at infinite cost to himself—He’s put you into a relationship so that you’ll never be rejected by Him—then your motivation when you sin is to go get Him. You want fellowship with Him. When the thing that most assures you is the thing that most convicts you, you’ll be okay because when you’re convicted of sin in a gospel way it drives you toward God.

Without the gospel we hate ourselves instead of our sin. Without the gospel we’re motivated through all sorts of awful fear and pride to change and it doesn’t really change our hearts; it just restrains our hearts.”

 Sin is a Suicide
“Every one of our sinful actions has a suicidal power on the faculties that put that action forth. When you sin with the mind, that sin shrivels the rationality. When you sin with the heart or the emotions, that sin shrivels the emotions. When you sin with the will, that sin destroys and dissolves your willpower and your self-control. Sin is the suicidal action of the self against itself. Sin destroys freedom because sin is an enslaving power.” 

Cure
“The secret to freedom from enslaving patterns of sin is worship. You need worship. You need great worship. You need weeping worship. You need glorious worship. You need to sense God’s greatness and to be moved it — moved to tears and moved to laughter — moved by who God is and what he has done for you.” 

Love & Marriage

“Falling in love in a Christian way is to say,'I am excited about your future and I want to be part of getting you there. I'm signing up for the journey with you. Would you sign up for the journey to my true self with me? It's going to be hard but I want to get there.” 
 
“[Spiritual friendship] is eagerly helping one another know, serve, love, and resemble God in deeper and deeper ways.” 
 
“To be loved but not known is comforting but superficial. To be known and not loved is our greatest fear. But to be fully known and truly loved is, well, a lot like being loved by God. It is what we need more than anything. It liberates us from pretense, humbles us out of our self-righteousness, and fortifies us for any difficulty life can throw at us.”

 "If single Christians don't develop a deeply fulfilling love relationship with Jesus, they will put too much pressure on their DREAM of marriage, and that will create pathology in their lives as well.” 
 
“Marriage has the power to set the course of your life as a whole. If your marriage is strong, even if all the circumstances in your life around you are filled with trouble and weakness, it won't matter. You will be able to move out into the world in strength.” 
 
“In any relationship, there will be frightening spells in which your feelings of love dry up. And when that happens you must remember that the essence of marriage is that it is a covenant, a commitment, a promise of future love. So what do you do? You do the acts of love, despite your lack of feeling. You may not feel tender, sympathetic, and eager to please, but in your actions you must BE tender, understanding, forgiving and helpful. And, if you do that, as time goes on you will not only get through the dry spells, but they will become less frequent and deep, and you will become more constant in your feelings. This is what can happen if you decide to love.” 
 
“You can only afford to be generous if you actually have some money in the bank to give. In the same way, if your only source of love and meaning is your spouse, then anytime he or she fails you, it will not just cause grief but a psychological cataclysm. If, however, you know something of the work of the Spirit in your life, you have enough love "in the bank" to be generous to your spouse even when you are not getting much affection or kindness at the moment.” 
 
“Love without truth is sentimentality; it supports and affirms us but keeps us in denial about our flaws. Truth without love is harshness; it gives us information but in such a way that we cannot really hear it. God's saving love in Christ, however, is marked by both radical truthfulness about who we are and yet also radical, unconditional commitment to us. The merciful commitment strengthens us to see the truth about ourselves and repent. The conviction and repentance moves us to cling to and rest in God's mercy and grace.” 
 
“Love without truth is sentimentality; it supports and affirms us but keeps us in denial about our flaws. Truth without love is harshness; it gives us information but in such a way that we cannot really hear it.” 
 
“To the degree you experience God's love towards you - seeing you as beautiful and radiant - to that degree sex won't ruin your life.”
 
“Real love, the Bible says, instinctively desires permanence.” 
 
“The reason that marriage is so painful and yet wonderful is because it is a reflection of the gospel, which is painful and wonderful at once. The gospel is this: We are more sinful and flawed in ourselves than we ever dared believe, yet at the very same time we are more loved and accepted in Jesus Christ than we ever dared hope.” 
 
“When over the years someone has seen you at your worst, and knows you with all your strengths and flaws, yet commits him- or herself to you wholly, it is a consummate experience. To be loved but not known is comforting but superficial. To be known and not loved is our greatest fear. But to be fully known and truly loved is, well, a lot like being loved by God. It is what we need more than anything. It liberates us from pretense, humbles us out of our self-righteousness, and fortifies us for any difficulty life can throw at us.” 
 
“Our culture says that feelings of love are the basis for actions of love. And of course that can be true. But it is truer to say that actions of love can lead consistently to feelings of love.” 
 
“Only with time do we really learn who the other person is and come to love the person for him- or herself and not just for the feelings and experiences they give us.” 
 
“This principle - that your spouse should be capable of becoming your best friend - is a game changer when you address the question of compatibility in a prospective spouse. If you think of marriage largely in terms of erotic love, then compatibility means sexual chemistry and appeal. If you think of marriage largely as a way to move into the kind of social status in life you desire, then compatibility means being part of the desired social class, and perhaps common tastes and aspirations for lifestyle. The problem with these factors is that they are not durable. Physical attractivess will wane, no matter how hard you work to delay its departure. And socio-economic status unfortunately can change almost overnight. When people think they have found compatibility based on these things, they often make the painful discovery that they have built their relationship on unstable ground. A woman "lets herself go" or a man loses his job, and the compatibility foundation falls apart.” 
 
“In sharp contrast with our culture, the Bible teaches that the essence of marriage is a sacrificial commitment to the good of the other. That means that love is more fundamentally action than emotion. But in talking this way, there is a danger of falling into the opposite error that characterized many ancient and traditional societies. It is possible to see marriage as merely a social transaction, a way of doing your duty to family, tribe and society. Traditional societies made the family the ultimate value in life, and so marriage was a mere transaction that helped your family's interest. By contrast, contemporary Western societies make the individual's happiness the ultimate value, and so marriage becomes primarily an experience of romantic fulfillment. But the Bible sees GOD as the supreme good - not the individual or the family - and that gives us a view of marriage that intimately unites feelings AND duty, passion AND promise. That is because at the heart of the Biblical idea of marriage is the covenant.” 
 
“Those dreaming of the perfect match are outnumbered by those who don't really want it at all, though perhaps they can't admit it. After all, our culture makes individual freedom, autonomy and fulfillment the very highest values, and thoughtful people know deep down that any love relationship at all means the loss of all three. You can say, 'I want someone who will accept me just as I am,' but in your heart of hearts you know that you are not perfect, that there are plenty of things about you that need to be changed, and that anyone who gets to know you up close and personal will want to change them.” 
 
 “Friendship is a deep oneness that develops when two people, speaking the truth in love to one another, journey together to the same horizon.” 

“All forms of love are necessary, and none are to be ignored, but all of us find some forms of love to be more emotionally valuable to us. They are a currency that we find particularly precious, a language that delivers the message of love to our hearts with the most power. Some types of love are more thrilling and fulfilling to us when we receive them..”