Philippians 3:18

For many walk, of whom I told you often, and now tell you even weeping, that they are enemies of the cross of Christ.

For many walk ... These are the evil walkers, and Christians are admonished also to mark these (Romans 16:17), that is, to identify them in order to thwart their evil devices against the church.

MacKnight's paraphrase is valuable, thus:

For many teachers walk very differently, who I have often said to you, and now even weeping I repeat it, are enemies of the cross of Christ, both by teaching that men are pardoned only through the Levitical sacrifices, and by refusing to suffer with Christ for the truth[30]

"Those described here were not Judaizers; this would have elicited a different reaction than weeping."[31] This, of course, is a different view from that expressed in Macknight's paraphrase; but there is no reason why both classes of evil-workers were not in Paul's view. (Nevertheless, Lightfoot also took the persons denounced in this passage to be "the antinomian reactionists, the same as those in Romans 16:18)."[32] Those were the persons, professing to be wise, and yet by no means innocent in their wisdom. In any case, a more complete description of those "enemies" is in the next verse.

[30] James Macknight, op. cit., p. 457.

[31] Robert H. Mounce, op. cit., p. 773.

[32] J. B. Lightfoot, op. cit., p. 155.