It is the active exercise of our faculties in conformity with virtue that causes happiness, and the opposite activities its opposite.

The soul becomes prudent by sitting and being quiet.

The appropriate age for marrige is around eighteen and thirty-seven for man

The greatest thing by far is to be a master of metaphor; it is the one thing that cannot be learned from others; and it is also a sign of genius, since a good metaphor implies an intuitive perception of the similarity of the dissimilar.

[Hope is] the dream of a waking man.

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

For we do not think that we know a thing until we are acquainted with its primary conditions or first principles, and have carried our analysis as far as its simplest elements.