Not the fruit of experience, but experience itself, is the end.
Every intellectual product must be judged from the point of view of the age and the people in which it was produced.
To know when one's self is interested, is the first condition of interesting other people.
How shall we pass most swiftly from point to point, and be present always at the focus where the greatest number of vital forces unite in their purest energy. To burn always with this hard, gem-like flame, to maintain this ecstasy, is success in life.