He's not safe, but he's good (referring to Aslan, the Lion, in The Lion, the Witch and the Wardrobe)

You must make your choice: either this man was, and is, the Son of God, or else a madman or something worse. You can shut him up for a fool, you can spit at him and kill him as a demon; or you can fall at his feet and call him Lord and God. But let us not come with any patronizing nonsense about his being a great human teacher. He has not left that open to us. He did not intend to.

Teach them to estimate the value of each prayer by their success in producing the desired feeling; and never let them suspect how much success or failure of that kind depends on whether they are well or ill, fresh or tired, at the moment.

It is no more possible for God than for the weakest of His creatures to carry out both of two mutually exclusive alternatives; not because His power meets an obstacle, but because nonsense remains nonsense even when we talk it about God.- The Problem of Pain, p. 18

The thing is to rely on God. The time will come when you will regard all this misery as a small price to pay for having been brought to that dependence. Meanwhile, the trouble is that relying on God has to begin all over again every day as if nothing has yet been done.

A proud man is always looking down on things and people; and, of course, as long as you are looking down, you cannot see something that is above you.

And out of that hopeless attempt has come nearly all that we call human history—money, poverty, ambition, war, prostitution, classes, empires, slavery—the long terrible story of man trying to find something other than God which will make him happy.

There have been men before now who got so interested in proving the existence of God that they came to care nothing for God Himself.

Everyone who believes in God at all believes that he knows what you and I are going to do tomorrow.