To God all things are beautiful, good, and right human beings, on the other hand, deem some things right and others wrong.

Abundance of knowledge does not teach men to be wise.

If it were not for injustice, men would not know justice.

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

It is better to hide ignorance, but it is hard to do this when we relax over wine.

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

Nothing is permanent but change.

You can’t step twice into the same river.

Everything flows and nothing stays.

Even sleepers are workers and collaborators in what goes on in the Universe.