No, the phrase "physician, heal thyself" is not attributed to Plato. It actually comes from the Bible in Luke 4:23.
Know Thyself
poznej sam sebe - i had it verified and tattoed
Know thyself.
Know thyself
(Temet nosce - thine own-self you must know)translated in the Matrix as know thyself
Not that I'm aware of. But there is a place in the Bible that says, You are a lier if you say you have not sinned.
No, it does not say that; but there is another thing the Bible says in relation to your question: Lay hands suddenly on no man, neither be partaker of other men's sins: keep thyself pure (1Timothy 5.22)
Socrates encouraged people to know thyself
plato to socrates
know thyself
Plato or Socrates