Theognis (540 BC - 480 BC / Greece)

To beget and rear a man is easier than to put good sense
Inside him. No one yet has ever contrived a way
To make the senseless sensible and good men out of bad.
If the sons of Asklepios had this gift from the god,
To work a cure on badness and men's infatuate wits,
Many and great would be the fees they earned.
And if understanding could be fashioned and placed in a man,
Never would a good man's son have turned out bad,
By heeding the words of sensible counsel. But as it is, no teaching
Will ever serve to make the bad man good.