Matthew 12:30 - Ellicott's Commentary On The Whole Bible

He that is not with me is against me. — The words seem at first at variance with the answer to the sons of Zebedee, when they reported that they had seen one casting out devils in the name of Christ, and had forbidden him “because he followed not” with them. Then they heard,” Forbid him not: for he that is not against us is for us” (Luke 9:50); and those words have naturally been the watchword of those who rejoice when Christ is preached every way, and by whatever organisation. In reality, however, the two formulæ do but present the opposite poles of the same truth. In the great struggle between light and darkness, good and evil, God and the enemy of God, there is no neutrality. The man of whom the two disciples complained was fighting against the devil in the name of Christ, and was therefore with Him. The Pharisees were hindering and slandering that work, and therefore were on the side of Satan. They were not gathering in God’s harvest of souls, and therefore they were scattering and wasting.