I remember a visit in my student years in Oxford from Archimandrite Sophrony, the disciple of St. Silouan of Mt. Athos. He gave a talk on Orthodoxy, and there was a discussion afterwards. Towards the end, the chairman said, “We have time for just one more question.” Somebody got up at the back of the audience and said, “Fr. Sophrony, please tell us — what is God?” And Fr. Sophrony answered very briefly, “You tell me — what is man?” God and the human person are two mysteries that are interconnected, and neither can be understood apart from the other. “In the image of God” means there’s a vertical reference in our personhood. We can only be understood in terms of our link with the divine.

~ Bishop Kallistos Ware, “What is Man?”

The whole article is excellent and highly recommended.