If we wish to understand the power of Christ's blood, we should go back to the ancient account of its prefiguration in Egypt. 'Sacrifice a lamb without blemish', commanded Moses, 'and sprinkle its blood on your doors'. If we were to ask him what he meant, and how the blood of an irrational beast could possibly save people endowed with reason, his answer would be that the saving power lies not in the blood itself, but in the fact that it is a sign of the Lord's blood. In those days, when the destroying angel saw the blood on the doors he did not dare to enter, so how much less will the devil approach now when he sees, not that figurative blood on the doors, but the true blood on the lips of believers, the doors of the temple of Christ.
Teaching & Living the Faith: June 2012 Archives
No one is to be called a Theist, who does not believe in a Personal God, whatever difficulty there may be in defining the word "Personal." Now it is the belief of Catholics about the Supreme Being, that this essential characteristic of His Nature is reiterated in three distinct ways or modes; so that the Almighty God, instead of being One Person only, which is the teaching of Natural Religion, has Three Personalities, and is at once, according as we view him in the one or the other of them, the Father, the Son, and the Spirit--a Divine Three, who bear towards Each Other the several relations which those names indicate, and are {125} in that respect distinct from Each Other, and in that alone.
John Henry Newman
An Essay in aid of a Grammar of Assent, Chapter 5