The prophets, foretold that God would be seen by men. As the Lord himself says: Blessed are the clean of heart, for they shall see God. In his greatness and inexpressible glory no one can see God and live, for the Father is beyond our comprehension. But in his love and generosity and omnipotence he allows even this to those who love him, that is, even to see God, as the prophets foretold. For what is impossible to men is possible to God.

By his own powers man cannot see God; yet God will be seen by men because he wills it. He will be seen by those he chooses, at the time he chooses, and in the way he chooses, for God can do all things. He was seen of old through the Spirit in prophecy; he is seen through the Son by our adoption as his children, and he will be seen in the kingdom of heaven in his own being as the Father. The Spirit prepares man to receive the Son of God, the Son leads him to the Father, and the Father, freeing him from change and decay, bestows the eternal life that comes to everyone from seeing God.

As those who see light are in the light sharing its brilliance, so those who see God are in God sharing his glory, and that glory gives them life. To see God is to share in life. ...Irenaeus