The wise man can change his mind; the stubborn one, never.

Enlightenment is man's emergence from his self-imposed nonage. Nonage is the inability to use one's own understanding without another's guidance. This nonage is self-imposed if its cause lies not in lack of understanding but in indecision and lack of courage to use one's own mind without another's guidance. Dare to know!

A lie is the abandonment and, as it were, the annihilation of the dignity by man.

Man must be disciplined, for he is by nature raw and wild.

Why were a few, or a single one, made at all, if only to exist in order to be made eternally miserable, which is infinitely worse than non-existence?

Thinking in pictures precedes thinking in words.

The more we come in contact with animals and observe their behaviour, the more we love them, for we see how great is their care of the young.