First there is a time when we believe everything, then for a little while we believe with discrimination, then we believe nothing whatever, and then we believe everything again - and, moreover, give reasons why we believe.

Non cogitant, ergo non sunt.

One might call habit a moral friction: something that prevents the mind from gliding over things but connects it with them and makes it hard for it to free itself from them.

If an angel were to tell us about his philosophy, I believe many of his statements might well sound like '2 x 2= 13'.

Some people feel with their heads and think with their hearts.

The ordinary man is ruined by the flesh lusting against the spirit; the scholar by the spirit lusting too much against the flesh.

I have remarked very clearly that I am often of one opinion when I am lying down and of another when I am standing up.