Much learning does not teach understanding.

Everything flows and nothing abides; everything gives way and nothing stays fixed.

All is flux, nothing stays still

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

You can't go home again. Your childhood is lost. The friends of your youth are gone. Your present is slipping away from you. Nothing is ever the same.

Everything rests by changing.