The self-explorer, whether he wants to or not, becomes the explorer of everything else. He learns to see himself, but suddenly, provided he was honest, all the rest appears, and it is as rich as he was, and, as a final crowning, richer.
The most excellent and divine counsel, the best and most profitable advertisement of all others, but the least practiced, is to study and learn how to know ourselves. This is the foundation of wisdom and the highway to whatever is good. God, Nature, the wise, the world, preach man, exhort him both by word and deed to the study of himself.