All that we know is nothing can be known.

Whenever, therefore, people are deceived and form opinions wide of the truth, it is clear that the error has slid into their minds through the medium of certain resemblances to that truth.

Musical training is a more potent instrument than any other, because rhythm and harmony find their way into the inward places of the soul, on which they mightily fasten, imparting grace, and making the soul of him who is rightly educated graceful, or of him who is ill-educated ungraceful.

Young people nowadays love luxury; they have bad manners and contempt for authority. They show disrespect for old people... contradict their parents, talk constantly in front of company, gobble their food and tyrannize their teachers.

I pray Thee, O God, that I may be beautiful within.

I do nothing but go about persuading you all, old and young alike, not to take thought for your persons or your properties, but and chiefly to care about the greatest improvement of the soul.

To know thyself is the beginning of wisdom.