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.

If you went in search of it, you would not find the boundaries of the soul, though you traveled every road-so deep is its measure [logos].

Not I but the world says it: All is one.

Day by day, what you do is who you become.

You can never step in the same river twice.

Immortal mortals, mortal immortals, one living the others death and dying the others life.

Our envy always lasts longer than the happiness of those we envy.