Saint Irenaeus of Lyons

The glory of God gives life; those who see God receive life. Men will therefore see God if they are to live; through the vision of God they become immortal and attain to God himself. God is the source of all activity throughout creation. He cannot be seen or described in his own nature and in all his greatness by any of his creatures. Yet he is certainly not unknown. Through his Word the whole creation learns that there is one God the Father, who holds all things together and gives them their being. As it is written in the Gospel, “No man has ever seen God, except the only-begotten Son, who is in the bosom of the Father; he has revealed him.” From the beginning the Son is the one who teacher us about the Father; he is with the Father from the beginning. The Word revealed God to men and presented men to God. Life in man is the glory of God; the life of man is the vision of God. If the revelation of God through creation gives life to all who live upon the earth, much more does the manifestation of the Father through the Word give life to those who see God.

-- Saint Irenaeus of Lyons from "Against the Heresies"