Neither should men study war with a view to the enslavement of those who do not deserve to be enslaved; but first of all they should provide against their own enslavement, and in the second place obtain empire for the good of the governed, and not for the sake of exercising a general despotism, and in the third place they should seek to be masters only over those who deserve to be slaves.

Greatness of spirit is accompanied by simplicity and sincerity.

Every great genius has an admixture of madness.

It is well to be up before daybreak, for such habits contribute to health, wealth, and wisdom.

The soul never thinks without a picture.

There is a foolish corner in the brain of the wisest man.

The chief forms of beauty are order and symmetry and definiteness, which the mathematical sciences demonstrate in a special degree.