Heraclitus somewhere says that all things are in process and nothing stays still, and likening existing things to the stream of a river he says that you would not step twice into the same river.

All is flux, nothing is stationary.

War is the father and king of all.

There is nothing permanent in the world except change.

All things come into being through opposition and all are in flux like a river

To get everything you want is not a good thing. Disease makes health seem sweet. Hunger leads to the appreciation of being full-fed. Tiredness creates the enjoyment of resting

The best people renounce all for one goal, the eternal fame of mortals; but most people stuff themselves like cattle.