Ans: The Scriptures teach that God is absolutely holy, just and righteous, or morally self–consistent.
1 Pet. 1:15–16. 15But as he which hath called you is holy, so be ye holy in all manner of conversation; 16Because it is written, Be ye holy; for I am holy.
Psa. 145:17. The LORD is righteous in all his ways, and holy in all his works.
See also: Isa. 6:1–3; 57:15; Rom. 3:21–26.
God is morally self–consistent, i.e., he is absolutely holy and righteous, and therefore cannot be inconsistent in his moral character. He is both right and righteous, never wrong or unrighteous. Because God is absolutely righteous, whatever he does or commands is right (Gen. 18:25). Because God is absolute and transcendent, there is no higher moral law or principle than the moral character of God. Man is fully accountable to God, but God is in no way accountable to man—or anyone else. Although God is not accountable to man, yet believers are challenged to argue his promises and persevere in earnest prayer (Lk. 11:1–13; 18:1–8; Jas. 5:16–18).
God is absolute, never arbitrary, as he himself is both the source, support and end of all things and is morally self–consistent [absolutely righteous]. Because God is morally self–consistent or absolutely righteous, he cannot arbitrarily set aside sin—he must be propitiated. His moral self–consistency demands that either the sinner be punished, or an innocent, suitable substitute take the sinner’s place [vicarious or substitutionary atonement]. The eternal, redemptive purpose of God is to redeem a covenant people, make them conformable to his moral self–consistency and conform them to the image of his Son (Rom. 8:29; 2 Cor. 3:17–18; Eph. 1:3–7; 1 Pet. 1:15–16; 2:9). This redemptive purpose necessarily delivers from the guilt, penalty [justification], pollution, power [sanctification] and presence [glorification] of sin (Rom. 8:29–30). Have you been reconciled to this God through the Lord Jesus Christ?
By Dr. W.R. Downing