Book III · 15
They know not how many things are signified by the words stealing, sowing, buying, keeping quiet, seeing what ought to be done; for this is not effected by the eyes, but by another kind of vision.
They know not how full of meaning are—to thieve, to sow, to buy, to be at peace, to see what needs doing, and this is not a matter for the eye but for another sort of sight.
Marcus Aurelius, Meditations III.15. Translated by George Long (1862). The Stoic Library.