12 This lesson in the Divine mysteries was gladly welcomed by my soul, now drawing near through the flesh to God, called to new birth through faith, entrusted with liberty and power to win the heavenly regeneration, conscious of the love of its Father and Creator, sure that He would not annihilate a creature whom He had summoned out of nothing into life. And it could estimate how high are these truths above the mental vision of man; for the reason which deals with the common objects of thought can conceive of nothing as existent beyond what it perceives within itself or can create out of itself. My soul measured the mighty workings of God, wrought on the scale of His eternal omnipotence, not by its own powers of perception but by a boundless faith; and therefore refused to disbelieve, because it could not understand, that God was in the beginning with God, and that the Word became flesh and dwelt among us, but bore in mind the truth that with the will to believe would come the power to understand.
Source: On the Trinity (New Advent)