Therefore, such a person may, some time or other, be defeated, and not think himself concerned with that precept of Atreus, And let men so conduct themselves in life, As to be always strangers to defeat.
But such a man, as I have said, will be defeated; and not only defeated, but made a slave of.

But we would have virtue always free, always invincible; and were it not so, there would be an end of virtue.
But if virtue has in herself all that is necessary for a good life, she is certainly sufficient for happiness: virtue is certainly sufficient, too, for our living with courage; if with courage, then with a magnanimous spirit, and indeed so as never to be under any fear, and thus to be always invincible.

Hence it follows that there can be nothing to be repented of, no wants, no lets or hinderances.

Thus all things will be prosperous, perfect, and as you would have them, and, consequently, happy; but virtue is sufficient for living with courage, and therefore virtue is able by herself to make life happy.

For as folly, even when possessed of what it desires, never thinks it has acquired enough, so wisdom is always satisfied with the present, and never repents on her own account.
XIX.