The soul is characterized by these capacities; self-nutrition, sensation, thinking, and movement.

There is nothing strange in the circle being the origin of any and every marvel.

Meanness is incurable; it cannot be cured by old age, or by anything else.

Equality is of two kinds, numerical and proportional; by the first I mean sameness of equality in number or size; by the second, equality of ratios.

Property should be in a certain sense common, but, as a general rule, private; for, when every one has a distinct interest, men will not complain of one another, and they will make more progress, because every one will be attending to his own business.

The physician heals, Nature makes well.

Music directly represents the passions of the soul. If one listens to the wrong kind of music, he will become the wrong kind of person.