All things flow, nothing abides. You cannot step into the same river twice, for the waters are continually flowing on. Nothing is permanent except change.

Those who love wisdom must investigate many things

All is flux; nothing stays still.

There is nothing permanent except change.

To God all things are fair and good and right, but men hold some things wrong and some right.

He who does not expect will not find out the unexpected, for it is trackless and unexplored

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.