Letter 72 — On Business as the Enemy of Philosophy (§6)

“The difference, I say, between a man of perfect wisdom and another who is progressing in wisdom is the same as the difference between a healthy man and one who is convalescing from a severe and lingering illness, for whom “health” means only a lighter attack of his disease. If the latter does not take heed, there is an immediate relapse and a return to the same old trouble; but the wise man cannot slip back, or slip into any more illness at all.”