Galatians 4:17

17.They are jealous of you. He comes at length to the false apostles, and does more by silence to make them odious, than if he had given their names; for we usually abstain from naming those whose very names produce in us dislike and aversion. He mentions the immoderate ambition of those men, and warns the Galatians not to be led astray by their appearance of zeal. The comparison is borrowed from honorable love, as contrasted with those professions of regard which arise from unhallowed desires. Jealousy, on the part of the false apostles, ought not to impose upon them; for it proceeded not from right zeal, but from an improper desire of obtaining reputation, — a desire most unlike that holy jealousy of which Paul speaks to the Corinthians.

“For I am jealous over you with godly jealousy; for I have espoused you to one husband, that I may present you as a chaste virgin to Christ. But I fear lest by any means, as the serpent beguiled Eve through his subtlety, so your minds should be corrupted from the simplicity that is in Christ.”
(2 Corinthians 11:2.)

To expose still more fully their base arts, he corrects his language. Yea, they would exclude you (69) They not only endeavor to gain your affections, but, as they cannot obtain possession of you by any other means, they endeavor to kindle strife between us. When you have been thrown as it were destitute, they expect that you will yield yourselves up to them; for they perceive that, so long as there shall be maintained between us a religious harmony, they can have no influence. This stratagem is frequently resorted to by all the ministers of Satan. By producing in the people a dislike of their pastor, they hope afterwards to draw them to themselves; and, having disposed of the rival, to obtain quiet possession. A careful and judicious examination of their conduct will discover that in this way they always begin.

“There is a good zeal, when one emulates in such a manner as to imitate virtue; and there is a bad zeal, which ‘drives away’ from virtue one who is acting right. And this is what they are now attempting to do, when they wish to ‘drive away’ from perfect knowledge, and to lead them to that which is mutilated and spurious, for no other reason than that they may occupy the ranks of teachers, and that you, who are higher than themselves, may be placed by them in the rank of scholars; for this is what he meant by saying, ‘that ye may emulate them.’” — Chrysostom.