6 My brethren, if we acknowledge our price, that it is the blood of the Lamb, who are they who this day celebrate the festival of the blood of I know not what woman, and how ungrateful are they! The gold was snatched, they say, from the ear of a woman, and the blood ran, and the gold was placed on a pair of scales or on a balance, and the advantage was much on the side of the blood. If the blood of a woman was sufficiently weighty to outweigh the gold, what power to outweigh the world has the blood of the Lamb by whom the world was made?
And, indeed, that spirit, I know not who, was pacified by the blood that he should depress the weight. Impure spirits knew that Jesus Christ would come, they had heard of His coming from the angels, they had heard of it from the prophets, and they expected it. For if they were not expecting it, why did they exclaim, “What have we to do with You? Are You come before the time to destroy us? We know who You are; the Holy One of God.” They expected that He would come, but they were ignorant of the time.
But what have you heard in the psalm regarding Jerusalem? “For Your servants have taken pleasure in her stones, and will pity the dust thereof. You shall arise,” says he, “and have mercy upon Zion: for the time has come that You will have mercy upon her.” When the time came for God to have mercy, the Lamb came. What sort of a Lamb whom wolves fear? What sort of a Lamb is it who, when slain, slew a lion? For the devil is called a lion, going about and roaring, seeking whom he may devour. By the blood of the Lamb the lion was vanquished.
Behold the spectacles of Christians. And what is more: they with the eyes of the flesh behold vanity, we with the eyes of the heart behold truth. Do not think, brethren, that our Lord God has dismissed us without spectacles; for if there are no spectacles, why have ye come together today? Behold, what we have said you saw, and you exclaimed; you would not have exclaimed if you had not seen. And this is a great thing to see in the whole world, the lion vanquished by the blood of the Lamb: members of Christ delivered from the teeth of the lions, and joined to the body of Christ.
Therefore some spirit or other contrived the counterfeit that His image should be bought for blood, because he knew that the human race was at some time to be redeemed by the precious blood. For evil spirits counterfeit certain shadows of honor to themselves, that they may deceive those who follow Christ. So much so, my brethren, that those who seduce by means of amulets, by incantations, by the devices of the enemy, mingle the name of Christ with their incantations: because they are not now able to seduce Christians, so as to give them poison they add some honey, that by means of the sweet the bitter may be concealed, and be drunk to ruin.
So much so, that I know that the priest of that Pilleatus was sometimes in the habit of saying, Pilleatus himself also is a Christian. Why so, brethren, unless that they were not able otherwise to seduce Christians?
Source: Tractates on the Gospel of John (New Advent)