The opposite is beneficial; from things that differ comes the fairest attunement; all things are born through strife.
HeraclitusTo God all things are fair and good and right, but men hold some things wrong and some right.
HeraclitusHistory is a child building a sand-castle by the sea, and that child is the whole majesty of man's power in the world.
HeraclitusAll 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.
Heraclitus