[rdb3]

Not to quibble but it was King David, not Plato, that first posed the question, "what is man".

that thou art mindful of him? and the son of man, that thou visitest him?
Psalms 8:4

101 things that the Mozilla browser can do that Internet Explorer cannot.

[MissAmericanPie]

Yes, Psalm 8. Thou hast made him a little lower than the angels and crowned him with glory and honor. Thou madest him to have dominion over the works of thy hands; thou hast put all things under his feet.

To me this answers all questions regarding, "what is man".
God came here became one of us, joined us eternally to Himself as part of Himself. As of yet not all things have been put under our feet, as of yet we do not have dominion over all the works of His hands, yet, in His own good time, it would appear that mankind has an astounding future.