Mark 13:6

(Epist. cxcix. 9.) In answer to the disciples, the Lord tells them of things which were from that time forth to have their course; whether He meant the destruction of Jerusalem which occasioned their question, or His own coming through the Church, (in which He ever comes even unto the end, for we know that He comes in His own, when His members are born day by day,) or the end itself, in which He will appear to judge the quick and the dead.

That, moreover, is absurd, that they do not think it is to be inquired who was the person that baptized, for the reason that he who has been baptized may have obtained grace by the invocation of the Trinity, of the names of the Father, and of the Son, and of the Holy Ghost. Then this will be the wisdom which Paul writes is in those who are perfected. But who in the Church is perfect and wise who can either defend or believe this, that this bare invocation of names is sufficient to the remission of sins and the sanctification of baptism; since these things are only then of advantage, when both he who baptizes has the Holy Spirit, and the baptism itself also is not ordained without the Spirit? But, say they, he who in any manner whatever is baptized without, may obtain the grace of baptism by his disposition and faith, which doubtless is ridiculous in itself, as if either a wicked disposition could attract to itself from heaven the sanctification of the righteous, or a false faith the truth of believers. But that not all who call on the name of Christ are heard, and that their invocation cannot obtain any grace, the Lord Himself manifests, saying, "Many shall come in my name, saying, I am Christ, and shall deceive many." Because there is no difference between a false prophet and a heretic. For as the former deceives in the name of God or Christ, so the latter deceives in the sacrament of baptism. Both strive by falsehood to deceive men's wills.

Even if such men were slain in confession of the Name, that stain is not even washed away by blood: the inexpiable and grave fault of discord is not even purged by suffering. He cannot be a martyr who is not in the Church; he cannot attain unto the kingdom who forsakes that which shall reign there. Christ gave us peace; He bade us be in agreement, and of one mind. He charged the bonds of love and charity to be kept uncorrupted and inviolate; he cannot show himself a martyr who has not maintained brotherly love. Paul the apostle teaches this, and testifies, saying, "And though I have faith, so that I can remove mountains, and have not charity, I am nothing. And though I give all my goods to feed the poor, and though I give my body to be burned, and have not charity, it profiteth me nothing. Charity is magnanimous; charity is kind; charity envieth not; charity acteth not vainly, is not puffed up, is not easily provoked, thinketh no evil; loveth all things, believeth all things, hopeth all things, endureth all things Charity never falleth." "Charity," says he, "never faileth." For she will ever be in the kingdom, she will endure for ever in the unity of a brotherhood linked to herself. Discord cannot attain to the kingdom of heaven; to the rewards of Christ, who said, "This is my commandment that ye love one another even as I have loved you: " he cannot attain who has violated the love of Christ b faithless dissension. He who has not charity has not God. The word of the blessed Apostle John is: "God," saith he, "is love; and he that dwelleth in love dwelleth in God, and God dwelleth in him." They cannot dwell with God who would not be of one mind in God's Church. […]

As to wars, when has the earth not been scourged by them at different periods and places? To pass over remote history, when the barbarians were everywhere invading Roman provinces in the reign of Gallienus, how many of our brothers who were then alive do we think could have believed that the end was near, since this happened long after the ascension of the Lord! Thus, we do not know what the nature of those signs will be when the end is really near at hand, if these present ones have not been so foretold that they should at least be understood in the church. Certainly, there are two nations and two kingdoms, namely, one of Christ, the other of the devil.

(ubi sup.) For many came forward, when destruction was hanging over Jerusalem, saying that they were Christs, and that the time of freedom was now approaching. Many teachers of heresy also arose in the Church even in the time of the Apostles; and many Antichrists came in the name of Christ, the first of whom was Simon Magus, to whom the Samaritans, as we read in the Acts of the Apostles, listened, saying, This man is the great power of God: wherefore also it is added here, And shall deceive many. (Acts 8:10)