Forgiveness of sins and eternal life are gifts of God, granted by his grace alone. Nobody can buy or work their way into eternal life. Eliezer, Ishmael, and Isaac make a great illustration of God's plan.
Romans 4:4-5, Genesis 15:1-5, Genesis 17:15-21

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A Metaphor of Grace in Eliezer, Ishmael, and Isaac

Now to the one who works, his wages are not counted as a gift but as his due. And to the one who does not work but believes in him who justifies the ungodly, his faith is counted as righteousness... R