An antinomian is someone who believes that once saved, they are under no obligation to obey God’s moral law, we can live however they want.
The legalist believes that you must obey the law in order to go to Heaven, and justification is based on our good works. These seem like opposite views, but in fact, they are very similar. They are, as one man said, “unidentical twins”. The person that declares there is no law has the spirit of legality. The lawless do not rejoice in the rest of Christ, but in freedom from law; which reveals the legalistic heart of the antinomian. Both the legalist and the antinomian have the same problem. One thinks the law can justify, the other rejoices that the law is gone and believes it to be altogether unprofitable. The legalist has a heart to keep the law to go to Heaven, the antinomian has a heart to break the law because he feels freed from its grievous hold on him. The legalist tries to keep the law because he feels he has to; the antinomian has no concern for the law, because he no longer feels he has to. Both people are running in opposite directions because of the law. One loves the law and runs under it for justification. The other hates the law and runs from it for perceived freedom. But both are running on account of the law.
The motivation is the law; the love of the law, or the hatred of law. The Child of God runs to Christ, with Christ, and for Christ. He is the freeman who is motivated by love for Christ. The Bible teaches that we are dead to the law for justification. We cannot, could not, and will not keep God’s law, and Jesus Christ came and freed us from the curse of the law. The law now has no condemning power over Christians any longer. We are not under the law for justification, but under grace. We are not free to live in sin because grace abounds. We follow Christ and keep His commandments, not for salvation, but because we have been saved. We do not obey God to be saved, but because we are. No longer is it “do this and live”, but “live and do this.” We cannot please God without faith and faith without works is dead. A Christian follows and obeys Christ, not out of hope of Heaven, but love for the Lord.
The Lord’s commandments are a rule of life to us, not a means of justification. We need to keep the car on the road and not drive into the ditch of the legalist who uses the law to earn salvation; and not to swerve to the other side into the ditch of antinomian and rebel against following Christ in spiritual anarchy against the Lordship of Christ. The remedy for antinomianism isn’t to become more legalistic and vice versa. Grace is the remedy for both errors.