The happiness of man is: I will. The happiness of woman is: he wills.

Is life not a thousand times too short for us to bore ourselves?

Anti-theses.- The most senile thing ever thought about man is contained in the celebrated saying 'the ego is always hateful'; the most childish is the even more celebrated 'love thy neighbor as thyself'. - In the former, knowledge of human nature has ceased, in the latter it has not yet even begun.

A man far oftener appears to have a decided character from persistently following his temperament than from persistently following his principles.

One must not let oneself be misled: they say 'Judge not!' but they send to Hell everything that stands in their way.

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

To escape boredom, man works either beyond what his usual needs require, or else he invents play, that is, work that is designed to quiet no need other than that for working in general.