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.
Under the comb, the tangle and the straight path are the same.
All things are in a state of flux.
Learning many things does not teach understanding
Corpses are more fit to be thrown out than is dung.
Hide our ignorance as we will, an evening of wine soon reveals it.