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The concept of substitution lies at the heart of both sin and salvation. For the essence of sin is man substituting himself for God, while the essence of salvation is God substituting himself for man.

John Stott (2012). “The Cross of Christ”, p.159, InterVarsity Press
The concept of substitution lies at the heart of both sin and salvation. For the essence of sin is man substituting himself for God, while the essence of salvation is God substituting himself for man.