12 It remains to say something more concerning the mysterious generation of the Son; or rather this something more is everything. I quiver, I linger, my powers fail, I know not where to begin. I cannot tell the time of the Son's birth; it were impious not to be certain of the fact. Whom shall I entreat? Whom shall I call to my aid? From what books shall I borrow the terms needed to state so hard a problem? Shall I ransack the philosophy of Greece? No! I have read, Where is the wise?
Where is the enquirer of this world ? In this matter, then, the world's philosophers, the wise men of paganism, are dumb: for they have rejected the wisdom of God. Shall I turn to the Scribe of the law? He is in darkness, for the Cross of Christ is an offense to him. Shall I, perchance, bid you shut your eyes to heresy, and pass it by in silence, on the ground that sufficient reverence is shown to Him Whom we preach if we believe that lepers were cleansed, the deaf heard, the lame ran, the palsied stood, the blind (in general) received sight, the blind from his birth had eyes given to him, devils were routed, the sick recovered, the dead lived. The heretics confess all this, and perish.
Source: On the Trinity (New Advent)