68 The Apostle is careful to leave no room for doubt: we cannot say, “Christ was born, suffered, was dead and buried, and rose again: but how, by what power, by what division of parts of Himself? Who wept? Who rejoiced? Who complained? Who descended? And Who ascended?” He rests the merits of faith entirely on the confession of unquestioning reverence. The righteousness, he says, which is of faith says thus, Say not in your heart, Who has ascended into heaven, that is, to bring Christ down: or Who has descended into the abyss: that is, to bring Christ up from the dead?
But what says the Scripture? Your word is near, in your mouth, and in your heart; that is, the word of faith which we preach: because if you shall confess with your mouth Jesus as Lord, and shall believe in your heart, that God has raised Him up from the dead, you shall be saved. Faith perfects the righteous man: as it is written, Abraham believed God and it was reckoned unto him for righteousness. Did Abraham impugn the word of God, when he was promised the inheritance of the Gentiles, and an abiding posterity as many as the sand or the stars for multitude?
To the reverent faith, which trusts implicitly on the omnipotence of God, the limits of human weakness are no barrier. Despising all that is feeble and earthly in itself, it believes the divine promise, even though it exceeds the possibilities of human nature. It knows that the laws which govern man are no hindrance to the power of God, Who is as bountiful in the performance as He is gracious in the promise. Nothing is more righteous than Faith. For as in human conduct it is equity and self-restraint that receive our approval, so in the case of God, what is more righteous for man than to ascribe omnipotence to Him, Whose Power He perceives to be without limits?
Source: On the Trinity (New Advent)