You cannot step into the same river twice.

One must know that war is common, justice is strife, and everything happens according to strife and necessity.

The sun is new each day.

To me one man is worth ten thousand if he is first-rate.

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.

The way up and the way down are one and the same.

There is nothing permanent except change.