Why did God perform incomprehensible miracles for the Jews, before the period known as historical?

The Catholic Answers

Men cannot be expected to believe in a doctrine as of God unless they have manifest signs that God is really speaking. But what do you mean by incomprehensible? If you mean that we cannot believe that they occurred, then the whole of historical science is useless. If you mean that they really happened, but that no man can comprehend the laws accounting for them, you are right. A miracle is a fact that occurs in a naturally incomprehensible way. If we could fully account for it apart from God, it would be because we could account for it by the ordinary laws of nature, and then it would not be a miracle. Finally, if God performed miracles before a period known as historical, we would know nothing of them. We know of them through history.

Radio Replies Volume 1 by Rev. Dr. Leslie Rumble MSC and Rev. Charles Mortimer Carty