Quote by Heraclitus ~ no man can cross the same river twice

ποταμοῖς τοῖς αὐτοῖς ἐμβαίνομέν τε καὶ οὐκ ἐμβαίνομεν

εἶμέν τε καὶ οὐκ εἶμεν.

 

We both step and do not step in the same rivers.

We are and are not.

Source:

http://www.newworldencyclopedia.org/entry/Heraclitus