Of all the sublime subjects tackled by Goodwin, this is among the best known and the most-often read. No matter how mature you are in your faith, Goodwin will open up a fresh, heavenly perspective that shows Christ at work from the beginning to the fulfillment of your life. He shows us the gospel in origin—as an eternal transaction among God the Father, God the Holy Spirit, and God the Son—for the salvation of man. Accomplishing salvation required a full and complete satisfaction for justice, something we could not do for ourselves. We need a mediator: first, someone who must be God, able to perfectly fulfill the broken promises of Adam’s race; and second, a man to be a representative substitute for us. As our mediator must be both God and man, our only Mediator could be Christ.