Learning is not child's play; we cannot learn without pain.

To enjoy the things we ought and to hate the things we ought has the greatest bearing on excellence of character.

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

Music has the power of producing a certain effect on the moral character of the soul, and if it has the power to do this, it is clear that the young must be directed to music and must be educated in it.

But nature flies from the infinite; for the infinite is imperfect, and nature always seeks an end.

The law is reason, free from passion.

. . . the man is free, we say, who exists for his own sake and not for another's.