“…what is most astonishing about this substitution of Christ for sinners is that it was God’s idea. Christ did not intrude on God’s plan to punish sinners. God planned for him to be there. One Old Testament prophet says, ‘It was the will of the Lord to crush him; he has put him to grief’ (Isaiah 53:10).”
(John Piper, Fifty Reasons Why Jesus Came to Die [Wheaton: Crossway, 2004] p. 22).
The rest of the above referenced book can be downloaded for free as a PDF. This book makes a great devotional for daily Lenten meditations.