When an acquaintance goes by I often step back from my window, not so much to spare him the effort of acknowledging me as to spare myself the embarrassment of seeing that he has not done so.

They do not think, therefore they are not.

The thoughts written on the walls of madhouses by their inmates might be worth publicizing.

Brevity: To say at once whatever is to be said.

Man loves company - even if it is only that of a small burning candle.

Doubt everything at least once, even the sentence "Two times two is four."

He was then in his fifty-fourth year, when even in the case of poets reason and passion begin to discuss a peace treaty and usually conclude it not very long afterwards.