For nothing is more democratic than logic; it is no respecter of persons and makes no distinction between crooked and straight noses.

We cannot live without valuing: but we can live without valuing what you value.

You want to be paid as well, you virtuous! You want reward for virtue, and heaven for earth, and eternity for your today?

Heaping glowing coals on another person's head is usually misunderstood and comes to nothing because the other person knows just as well that he is in the right and has also given some thought on his own part to heaping coals.

He who is usually self-sufficient becomes exceptionally vain and keenly alive to fame and praise when he is physically ill. The more he loses himself the more he has to endeavor to regain his position by means of the opinion of others.

Conversation with a friend will only bear good fruit of knowledge when both think only of the matter under consideration and forget that they are friends.

Evolution does not make happiness its goal; it aims simply at evolution and nothing else.