Nothing puts a greater obstacle in the way of the progress of knowledge than thinking that one knows what one does not yet know.

We have no words for speaking of wisdom to the stupid. He who understands the wise is wise already.

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.

I am grateful that I am not as judgmental as all those censorious, self-righteous people around me. In each of us there is a little of all of us.

If you are going to build something in the air it is always better to build castles than houses of cards.

It is said that truth comes from the mouths of fools and children: I wish every good mind which feels an inclination for satire would reflect that the finest satirist always has something of both in him.

To many people virtue consists chiefly in repenting faults, not in avoiding them.