Francis Turretin explains the necessity of the atonement, juxtaposing it with the nature of sin and the relationship of the sinner to God. He then demonstrates the redemption purchased by Christ and the nature of His death. Arguing against deviant notions, he rescues the orthodox understanding of the design and intent of Christ’s satisfaction. He describes the parallel between the Christ’s obedience to the law and the His suffering the law’s sanctions, along with its substitutionary characteristics for His people. Finally Turretin refutes errors concerning the extent of the atonement, and exhibits the orthodox treatment as being on behalf of God’s elect.