In letter #76, Seneca underscores the element of reason in human existence. He also surveys the subjects of wisdom, virtue, bravery, and what ingredients aggregate into the human soul.
“Wisdom is never a windfall. Money may come unsought, office may be bestowed, influence and prestige may be thrust upon you, but virtue is not an accident.
“What is best in man? Reason, which puts him ahead of the animals and next to the gods. Perfect reason is, then, his peculiar good; his other qualities are common to animals and vegetables.
“The sole good in man, therefore, is what is solely man’s, for our question does not concern the good but the good of man. If nothing but reason is peculiarly man’s, then reason is his sole good and balances all the rest.
“Folly may creep toward wisdom, but wisdom does not backslide to folly.
“…men bear with fortitude, when they have grown accustomed to them, things they had thought very difficult.
*All excerpts have been taken from The Stoic Philosophy of Seneca: Essays and Letters, W.W. Norton.