One who has a why can endure anyhow.

In almost all sciences the fundamental knowledge is either found in earliest times or is still being sought.

Insanity in individuals is something rare - but in groups, parties, nations and epochs, it is the rule.

Every word is a preconceived judgment.

Where there is the tree of knowledge, there is always Paradise: so say the most ancient and most modern serpents.

Tolerance is a proof of distrust in one's own ideals.

Be careful when you cast out your demons that you don’t throw away the best of yourself.