Why do some teachings oppose the doctrine of grace?

Many opposing teachings, such as free will works religion, legalism, and antinomianism, emerge from a failure to recognize the full sufficiency of God’s grace. For example, free will works religion suggests that salvation depends on an individual's choice, contradicting the Biblical assertion that it is God who chooses (John 15:16). Legalism insists on adherence to the law as part of salvation, undermining the message that we are justified by faith alone (Romans 3:20). Antinomianism abuses grace by suggesting that moral behavior is irrelevant, missing the call to live in a way that reflects our faith. Understanding these errors helps Christians hold fast to the truth of the gospel and live according to the grace they have received.