Heraclitus

“No man ever steps in the same river twice, for it’s not the same river and he’s not the same man.”

The only constant in the universe is change; the river, the man and everything is ever-changing. Anything to the contrary is an illusion.

While no man can step in the same river twice, he can drink from it many times. A man today can remember the experiences of the man he once was and use the knowledge gained from those experiences for his own welfare.