Some argued that sin of commission is the sin-nature of man which cannot be altered. However, the sin of commission stresses the deliberate nature of sin. Willful sins should not be done. The sin of commission is committed because of the flavor of sin, beauty of sin and the loftiness of sin (1 John 2:15-16). Cain willfully offered an unauthorized sacrifice to God and slaughtered his brother because God accepted his brother's sacrifice (Gen 4:1-10).
Some willful sins of the Old Testament are withholding tithes, offering and sacrifices. The willful sins were handled with sacrifice and restitution (Lev 5:14-6:7). Sins of commission in the New Testament include neglecting the assembly of the saints, refusing to provoke other to love and good works, ignoring weekly contributions, promoting sexual sin, covetousness, gossip and lying (Heb 10:24-25, 1 Cor 16:1-2, 6:9-10). Willful sin stresses that the sinner and his dreams are most important. The sinner's voice is greater and more powerful than that of God. The sinner's feeling is all that is important in this world and nothing is greater than the taste of sin. For the sin of commissions, one must confess them, repent of them and pray to God for forgiveness. "Confess, therefore, your sins to one another, and pray for one another, that ye may be healed. The supplication of a righteous man avails much in its working." (James 5:16, Acts 8:18-24).