Man is the most unhappy of all creatures, 504. The body has many
diseases, and they are readily perceived, 505. But the soul does
not readily perceive its own maladies; it even mistakes them for
indications of soundness, 506. The man diseased in body willingly
yields to the care of the physician, 506. The unruly passions of the
soul resist a cure, and are therefore more fatal, 507, 508.