Luke 9:50

Now John is not blamed, because he did this from love, but he is taught to know the difference between the strong and the weak. And therefore our Lord though He rewards the stronger, yet does not exclude the weak; as it follows, And Jesus said unto him, Forbid him not, for he that is not against you is for you. True, O Lord. For both Joseph and Nicodemus, through fear Thy secret disciples, when the time came, did not refuse their offices.

"Teacher, we saw one casting out devils in Thy name, and we forbade him." Has the sting of envy troubled the holy disciples? Do they grudge those highly favoured? Have even they admitted within them a passion so abominable and hateful to God? "We saw one, they say, casting out devils in Thy name, and we forbade him." Tell me, dost thou forbid one who in Christ's name troubles Satan, and crushes evil demons? How was it not thy duty rather to reflect, that he was not the doer of these wonders, but that the grace which was in him wrought the miracle by the power of Christ? How therefore dost thou forbid him who in Christ wins the victory? "Yes," he saith; "for he followeth not with us." Oh blind speech! For what if he be not numbered among the holy Apostles, who is crowned with Christ's grace, yet is he equally with you adorned with apostolic powers. There are many diversities of Christ's gifts, as the blessed Paul teacheth, saying; "that to one is given the word of wisdom, but to another the word of knowledge: and to another faith; and to another gifts of healings."

What therefore is the meaning of his "not walking with us," or what is the force of the expression? Look then; for I will tell you as well as I can. The Saviour gave the holy Apostles authority over unclean spirits, to cast them out, and to heal all disease and all sickness among the people. And so they did; nor was the grace given them ineffectual. For they returned with joy, saying; "Lord, even the devils are subject to us in Thy name." They imagined, therefore, that leave was given not to any one else but to themselves alone to be invested with the authority which He had granted them. For this reason they draw near, and want to learn, whether others also might exercise it, even though they had not been appointed to the apostleship, nor even to the office of teacher. We find something like this also in the ancient sacred Scriptures. For God once said to the hierophant Moses: "Choose thee seventy men of the elders of Israel, and I will take of the Spirit that is upon thee, and give it," He says, "to them." And when those who were chosen had assembled at the former tabernacle, two men only excepted, who had remained in the camp, and the spirit of prophecy descended upon them, not only those who were assembled in the holy tabernacle prophesied, but those also who had remained in the camp. But "Jeshua, it says, who stood before Moses, said, Eldad and Midad, lo! they prophesy in the camp. My lord Moses forbid them. And Moses said unto Jeshua, Enviest thou me? […]

Therefore in heretics and false catholics, it becomes us to abhor, and forbid not the common sacraments in which they are with us, and not against us, but the divisions contrary to peace and truth, wherein they are against us as following not the Lord.

Marvel then at the power of Christ, how His grace works by means of the unworthy and those who are not His disciples: as also men are sanctified through the priests, although the priests be not holy.