Given from the Catholic Broadcasting Station 2SM Sydney Australia
Choose a topic from Vol 3:
We know the truth of the Trinity beyond all doubt. We cannot demonstrate the existence of three divine Persons in the one divine Nature by intrinsic evidence drawn from an experimental knowledge of the divine Nature as it is in itself. But we can give all that reason requires to exclude all doubt as to its truth. Negatively we can show that the doctrine does not violate any rational principles. Positively we can show that God has revealed the doctrine.
Not for a single moment can one speak of the theory of evolution and of the doctrine of the Trinity as if they were on a par in the realm of our knowledge. Evolution is a conjecture of men based on a probable guess of human reason alone, and without adequate data. The doctrine of the Trinity is the authentic teaching of Christ with all the authority of God, who obviously must know the facts. The Trinity, therefore, is not a theory; it is absolutely certain with all the certainty of God's omniscience.
We have a mediate knowledge of its truth. We know that God is a reliable source of information, and that He has taught the doctrine. We believe it because God teaches it, and our faith gives us a knowledge of the truth which has an extrinsic certainty far above all degrees of mere probability. Evolution is a mere theory because man has not sufficient evidence to demonstrate its truth, and has no other source of information concerning it save that of the world about him. If, however, God stepped in and revealed to man that the evolutionary theory is true, then it would no longer be a mere theory, but a certainty, even though men discovered not a scrap more natural evidence to support it. Men would know of its truth just as a child would know the right answer to a sum if told by a teacher, despite omission or inability on the part of the child to do the preliminary work necessary to arrive at that answer. In the same way we have certainty of the religious truths God has revealed.
Yes, for difficulties concerning revealed mysteries do not affect the sound and reasonable foundation for one's acceptance of Christianity as the revelation of God. A difficulty in comprehending the full significance of a thing is not a doubt concerning its existence. There are scores of difficulties concerning things we know to be facts in the natural order with scientific certainty; but we do not deny them because of that.