He shall pray unto God, and he will be favourable unto him: and he shall see his face with joy: for he will render unto man his righteousness. He shall pray unto God - Being now adopted into the heavenly family, and become a new creature, he shall have the spirit of prayer, which is indeed the very breath and language of the new or spiritual life.
He will be favorable unto him - He shall manifest his good will to him; he shall live under the influences of Divine grace.
He shall see his face with joy - He shall know that God is reconciled to him; and this shall fill him with joy, בתרועה bithruah, with exultation: for, "being justified by faith, he has peace with God, through our Lord Jesus Christ, by whom he has received the atonement; and Rejoices in the hope of the glory of God."
He will render unto man his righteousness - So good and gracious is the Lord, that by his grace he will enable this convert to live to his glory, to bring forth all the fruits of the Spirit, and then reward him for the work, as if it were done by his own might.