21 These are the men who have taught me the doctrines which I hold, and so deeply am I impregnated with their teaching that no antidote can release me from their influence. Forgive me, O God Almighty, my powerlessness to change, my willingness to die in this belief. These propagators of blasphemy, for so they seem to me, are a product of these last times, too modern to avail me. It is too late for them to correct the faith which I received from You. Before I had ever heard their names, I had put my trust in You, had received regeneration from You and become Yours, as still I am.
I know that You are omnipotent; I look not that Thou should reveal to me the mystery of that ineffable birth which is secret between Yourself and Your Only-begotten. Nothing is impossible with You, and I doubt not that in begetting Your Son You exerted Your full omnipotence. To doubt it would be to deny that You are omnipotent. For my own birth teaches me that You are good, and therefore I am sure that in the birth of Your Only-begotten Thou grudged Him no good gift. I believe that all that is Yours is His, and all that is His is Yours.
The creation of the world is sufficient evidence to me that You are wise; and I am sure that Your Wisdom, Who is like You, must have been begotten from Yourself. And You are One God, in very truth, in my eyes; I will never believe that in Him, Who is God from You, there is ought that is not Yours. Judge me in Him, if it be sin in me that, through Your Son, I have trusted too well in Law and Prophets and Apostles.
Source: On the Trinity (New Advent)