Someone who knows too much finds it hard not to lie.

If life becomes hard to bear we think of improvements. But the most important and effective improvement, in our own attitude, hardly occurs to us, and we can decide on this only with the utmost difficulty.

You could attach prices to ideas. Some cost a lot some little. ... And how do you pay for ideas? I believe: with courage.

One might say: art shows us the miracles of nature. It is based on the concept of the miracles of nature.

Don't for heaven's sake, be afraid of talking nonsense! But you must pay attention to your nonsense.

I am showing my pupils details of an immense landscape which they cannot possibly know their way around.

Freud's fanciful pseudo-explanations (precisely because they are brilliant) perform a disservice. (Now any ass has these pictures available to use in "explaining" symptoms of an illness.

Religion is, as it were, the calm bottom of the sea at its deepest point, which remains calm however high the waves on the surface may be.

Wisdom is passionless. But faith by contrast is what Kierkegaard calls a passion.

I believe that one of the things Christianity says is that sound doctrines are all useless. That you have to change your life. (Or the direction of your life.)