They are the enemies of the cross— That is, "enemies to the doctrine of salvation by a dependance upon Christ crucified:" for while they directed men to seek salvation by observing the ceremonial law, they took them off from depending solely on Christ crucified, and so made the death of Christ insignificant and useless. See Galatians 2:21; Galatians 5:3-4. Some however rather understand this as referring to their immoral temper, afterwards described; the end and design of the cross being to attract our hearts from earth to heaven, they were enemies to it, as being unwilling to comply with that end and design. It is to be feared, that many converts from the Gentiles as well as from the Jews, answered this character; and if they did, it was entirely to the Apostle's purpose to reprove them.
Related Commentaries of Philippians 3:18
Philippians 3:18
18 (For many walk, of whom I have told you often, and now tell you even weeping, that they are the enemies of the cross of Christ: