8 But, Venerable Brethren, we shall never, however much we exert ourselves, succeed in calling men back to the majesty and empire of God, except by means of Jesus Christ. "No one," the Apostle admonishes us, "can lay other foundation than that which has been laid, which is Jesus Christ." (I. Cor .,iii., II.) It is Christ alone "whom the Father sanctified and sent into this world" ( Is . x., 36), "the splendor of the Father and the image of His substance" ( Hebr .i., 3), true God and true man: without whom nobody can know God with the knowledge for salvation, "neither doth anyone know the Father but the Son, and he to whom it shall please the Son to reveal Him." ( Matth . xi., 27.) Hence it follows that to restore all things in Christ and to lead men back to submission to God is one and the same aim. To this, then, it behoves Us to devote Our care - to lead back mankind under the dominion of Christ; this done, We shall have brought it back to God. When We say to God We do not mean to that inert being heedless of all things human which the dream of materialists has imagined, but to the true and living God, one in nature, triple in person, Creator of the world, most wise Ordainer of all things, Lawgiver most just, who punishes the wicked and has reward in store for virtue.
Source: E Supremi (Vatican.va)