Evagoras (81)

You must not be content if you chance to be already superior to your contemporaries, but you should be chagrined if, endowed as you are by nature, distantly descended from Zeus and in our own time from a man of such distinguished excellence, you shall not far surpass, not only all others, but also those who possess the same high station as yourself It is in your power not to fail in this: for if you persevere in the study of philosophy and make as great progress as heretofore, you will soon become the man it is fitting you should be.