You can never step in 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.
Everything changes and nothing stands still.
Dogs, also, bark at what they do not know.
Things of which there is sight, hearing, apprehension, these I prefer.
The best people renounce all for one goal, the eternal fame of mortals; but most people stuff themselves like cattle.