This is specially true of errors which release men from obligation to the law of God. After St. Paul had demonstrated the impossibility of justification by works compensative for sin, and had established the doctrine of justification through faith in Christ which works by love and purifies the heart, there started up a class of teachers who drew from Paul's teachings the fallacious inference that the law of God is abolished in the case of the believer, who is henceforth delivered from its authority as the rule of life.
Hence they became, what Luther first styled, Antinomians (Greek anti, against, and nomos, law). We infer from Rom. iii. 8, 31; vi.1; Eph. v. 6; 2 Peter ii. 18, 19, and James ii.17-26, in which warnings are given against perversion of the truth as an excuse for licentiousness, that Antinomianism, in its grosser form, found place in the primitive church. All along the history of the Church, a revival of the cardinal doctrine of justification, by faith only, has been followed by a resurrection of Antinomianism, which Wesley defines as "the doctrine which makes void the law through faith."
Those who aver that ultra-Calvinism is the invariable antecedent of Antinomianism, would be unwilling to accept the necessary inference that the apostle to the Gentiles was an ultra-Calvinist; yet it is true that the doctrines of Calvinism can be logically pushed to that conclusion. It is also true that other forms of doctrine which emphasize faith in Jesus Christ, as the sole ground of acceptance with God, are more or less liable to have the tares of Antinomianism spring up in their field.
The root of this error lies in a false view of the mediatorial work of Christ, that He performs for men the obedience which they ought to perform, and that God can justly demand nothing further from the delinquents. It is claimed that Christ's perfect virtues are reckoned to the believer in such a way as to excuse him for their absence; His chastity compensating for the absence of that moral quality in the believer. Hence, adultery and murder in King David, being compensated by the purity and benevolence of Jesus imputed to him in the mind of God, did not mar David's standing as righteous before God.
It should be said that the Gnostic sects were Antinomian on other grounds. They held that their spiritual natures could not contract moral pollution, whatever their moral conduct might be, sin inhering only in matter. As a piece of gold retains its purity while encompassed by the filth of the swine-sty, so the soul keeps pure amid the grossest sins. This species of Antinomianism was not limited to those who professed faith in Christ. It was adopted by all who held that all evil inheres in uncreated matter.
Modern Universalism is only another form of Antinomianism. It is the expectation of salvation through Christ, without obedience to either the law or the Gospel.
Christianity was very early disfigured by antinomianism, a doctrinal and practical error which opposes itself to God's law even in the evangelical form in which it was defined by His adorable Son, "Thou shalt love God with all thy heart, and thy neighbor as thyself." This had been the burden of Christ's preaching, with the hint that His own life was to be given, as a ransom for many, and to secure grace to enable them to fulfil God's law. The apostles, by precept and example, powerfully enforced their Lord's doctrine and practice. Their lives are true copies of their exhortations. It is hard to say which excite men most to believe and obey, their seraphic sermons or their saintly lives. Success crowned their labors. Both Judaism and paganism heard the thunder of their words of faith and fell prostrate beneath the lightning of their works of love.
But before all is lost, Satan hastens to "transform himself into an angel of light." In this disguise he instills speculative faith, instead of a saving faith which works by love, purifies the heart, and overcomes the world; he pleads for loose living, puts the badge of contempt upon the daily cross, and gets multitudes of Laodiceans and Gnostics into his snare. Sad and sure is the result. Genuine works of faith are neglected; idle works of men's invention are substituted for those of God's commandments; and fallen churches, gliding downward through the smooth way of antinomianism, return to the covert way of Phariseeism, or to the broad way of infidelity.
— edited from A Substitute for Holiness or Antinomianism Revived, Chapter 2.