I divide my time as follows: half the time I sleep, the other half I dream. I never dream when I sleep, for that would be a pity, for sleeping is the highest accomplishment of genius.

But doubt is wily and cunning and never, as it is sometimes said to be, loud or defiant. It is unassuming and sly, not bold or assertive - and the more unassuming, the more dangerous.

To be a teacher does not mean simply to affirm that such a thing is so, or to deliver a lecture, etc.

Only one deception is possible in the infinite sense, self-deception.

Sin is in itself separation from the good, but despair over sin is separation a second time.

It is so hard to believe because it is so hard to obey.

The truth is a snare: you cannot have it, without being caught. You cannot have the truth in such a way that you catch it, but only in such a way that it catches you.