Can the penalty of sin resting upon all mankind be remitted? Plainly not, if God is to remain God. That penalty of sin was ordained in the law of God, and the law of God was no mere arbitrary and changeable arrangement but an expression of the nature of God Himself. If the penalty of sin were remitted, God would become unrighteous, and that God will not become unrighteous is the most certain thing that can possibly be conceived.
How then can sinful men be saved? In one way only. Only if a substitute is provided who shall pay for them the just penalty of God’s law.
The Bible teaches that such a substitute has a matter of fact been provided. The substitute is Jesus Christ. The law’s demands of penalty must be satisfied. There is no escaping that. But Jesus Christ satisfied those demands for us when He died instead of us on the cross.
J Gresham Machen, The Doctrine of the Atonement: Three Lectures (Kindle Edition)