You cannot step twice into the same river; for other waters are continually flowing in.

You can never step into the same river; for new waters are always flowing on to you.

You cannot step twice into the same river, for other waters are constantly flowing on.

Upon those who step into the same rivers different and ever different waters flow down.

You cannot step into the same river twice.

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