Is there any knowledge in the world which is so certain that no reasonable man could doubt it? - Bertrand Russell

Respectability, regularity, and routine - the whole cast-iron discipline of a modern industrial society - have atrophied the artistic impulse, and imprisoned love so that it can no longer be generous and free and creative, but must be either stuffy or furtive.

Sometimes the hardest thing in life is to know which bridge to cross and which to burn

The man who has fed the chicken every day throughout its life at last wrings its neck instead, showing that more refined views as to the uniformity of nature would have been useful to the chicken.