Letter 94 (§1)

“That department of philosophy which supplies precepts appropriate to the individual case, instead of framing them for mankind at large—which, for instance, advises how a husband should conduct himself towards his wife, or how a father should bring up his children, or how a master should rule his slaves—this department of philosophy, I say, is accepted by some as the only significant part, while the other departments are rejected on the ground that they stray beyond the sphere of practical needs—as if any man could give advice concerning a portion of life without having first gained a knowledge of the sum of life as a whole!”