7 Do not, then, seek Christ elsewhere than where Christ wished Himself to be preached to you; and as He wished Himself to be preached to you, in that fashion hold Him fast, in that manner write Him on your heart. It is a wall against all the assaults, and against all the snares of the enemy. Do not fear, he does not tempt unless he has been permitted; it is certain that he does nothing unless permitted or sent. He is sent as an evil angel by a power holding him in control: he is permitted when he asks anything; and this, brethren, does not take place unless that the just may be tried, the unjust punished. Why, then, do you fear? Walk in the Lord your God; be assured, what He does not wish you to suffer you do not suffer; what He permits you to suffer is the scourge of one correcting, not the punishment of one condemning. We are being educated for an eternal inheritance, and do we spurn to be scourged? My brethren, if a boy were to refuse the punishment of cuffs or stripes from his father, would he not be called proud, incorrigible, ungrateful towards paternal discipline? And for what does an earthly father educate his son? That he may not lose the temporal things which he has acquired for him, which he has collected for him, which he does not wish him to lose, which he who leaves them cannot retain eternally. He does not teach a son with whom he is to possess, but one who is to possess after him. My brethren, if a father teaches a son who is to succeed him, and teaches him also that he will have to pass through all these things, in same way as he who is admonishing him is destined to pass through them, how do you wish that He educate us, our Father to whom we are not to succeed, but to whom we are to approach, and with whom we are to abide eternally in an inheritance which does not decay nor die, and which no storms can desolate? He is Himself both the inheritance and the Father. Shall we possess Him, and ought we not to undergo training? Let us hear the instruction of the Father. When our head aches, let us not have recourse to the superstitious intercessor, to the diviners and remedies of vanity. My brethren, shall I not mourn over you? Daily do I find these things; and what shall I do? Not yet have I persuaded Christians that their hope ought to be placed in God. Behold, if one dies to whom one of these remedies has been given (and how many have died with remedies, and how many have lived without them!), with what confidence does the spirit go forth to God? He has lost the sign of Christ, and has received the sign of the devil. Perhaps he may say that he has not lost the sign of Christ. You can have, then, the sign of Christ along with the sign of the devil. Christ does not desire community of ownership, but He desires to possess alone what He has purchased. He has bought at so great a price that He may possess alone: you make Him the partner of that devil to whom you sold yourself by your sin. “Woe to the double-hearted,” to those who in their hearts give part to God and part to the devil. God, being angry that the devil has part there, departs, and the devil will possess the whole. Not in vain, therefore, says the apostle, “Neither give place to the devil.” Let us know the Lamb, then, brethren; let us know our price.
8. “John stood, and two of his disciples.” Behold two of John's disciples: since John, the friend of the Bridegroom, was such as he was, he sought not his own glory, but bore witness to the truth. Did he wish that his disciples should remain with him and not follow the Lord? Rather he himself showed hisdisciples whom they should follow. For they accounted of him as though he were the lamb; and he said, “Why do you give heed to me? I am not the lamb; behold the Lamb of God,” of whom also he had already said, Behold the Lamb of God. And what benefit does the Lamb of God confer upon us? “Behold,” he says, “who takes away the sin of the world.” The two who were with John followed Him when they heard this.
Source: Tractates on the Gospel of John (New Advent)