To Demonicus (7-8)

But virtue, when it grows up with us in our hearts without alloy, is the one possession which abides with us in old age; it is better than riches and more serviceable than high birth; it makes possible what is for others impossible; it supports with fortitude that which is fearful to the multitude; and it considers sloth a disgrace and toil an honor.

This it is easy to learn from the labors of Heracles and the exploits of Theseus, whose excellence of character has impressed upon their exploits so clear a stamp of glory that not even endless time can cast oblivion upon their achievements.