Ideas too are a life and a world.

Virtue by premeditation isn't worth much.

I made the journey to knowledge like dogs who go for walks with their masters, a hundred times forward and backward over the same territory; and when I arrived I was tired.

The "second sight" possessed by the Highlanders in Scotland is actually a foreknowledge of future events. I believe they possess this gift because they don't wear trousers.

It often takes more courage to change one's opinion than to stick to it.

They do not think, therefore they are not.

A man is never more serious than when he praise himself.