You cannot step into the same river twice

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

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.

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.

Everything rests by changing.