All things are in flux; the flux is subject to a unifying measure or rational principle. This principle (logos, the hidden harmony behind all change) bound opposites together in a unified tension, which is like that of a lyre, where a stable harmonious sound emerges from the tension of the opposing forces that arise from the bow bound together by the string.

He who hears not me but the logos will say: All is one.

It is by disease that health is pleasant; by evil that good is pleasant; by hunger, satiety; by weariness, rest.

Men forget where the way leads and what they meet with every day seems strange to them.We should not act and speak like men asleep.

It would not be better if things happened to men just as they wish.

All things come into being by conflict of opposites.

Men that love wisdom must be acquainted with very many things indeed.