The Bible alone is the only authority that can bind the conscience of a person absolutely because it is the only authority that carries with it the intrinsic authority of God Himself.
R. C. SproulThere are only two ways that Godโs justice can be satisfied with respect to your sin. Either you satisfy it or Christ satisfies it. You can satisfy it by being banished from Godโs presence forever. Or you can accept the satisfaction that Jesus Christ has made.
R. C. SproulBut the blessing Christ promised, the blessing of great reward, is a reward of grace. The blessing is promised even though it is not earned. Augustine said it this way: Our rewards in heaven are a result of God's crowning His own gifts.
R. C. Sproul