Intuition is the source of scientific knowledge.

All persons ought to endeavor to follow what is right, and not what is established.

To die, and thus avoid poverty or love, or anything painful, is not the part of a brave man, but rather of a coward; for it is cowardice to avoid trouble, and the suicide does not undergo death because it is honorable, but in order to avoid evil.

At his best, man is the noblest of all animals; separated from law and justice he is the worst.

Men become richer not only by increasing their existing wealth but also by decreasing their expenditure.

All virtue is summed up in dealing justly.

Emotions of any kind are produced by melody and rhythm; therefore by music a man becomes accustomed to feeling the right emotions; music has thus the power to form character, and the various kinds of music based on various modes may be distinguished by their effects on character.