The admirable Plato himself, a most sound authority on such matters, altogether rejected the use of “Joy to you” as bad and pointless. He substitutes “Do well,” which implies a good state of both body and soul. In a letter to Dionysius
 Ep . III, 315B. 
 he censures him for greeting Apollo with “Joy to you”
in his poem to the god; it is unworthy of the Pythian, he says, and not even for men of taste is it becoming, let alone gods.