The concept of substitution may be said, then, to lie 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. Man asserts himself against God and puts himself where only God deserves to be. God sacrifices himself for man and puts himself where only man deserves to be. Man claims prerogatives which belong to God alone. God accepts penalties which belong to man alone.
~ John R. W. Stott in The Cross of Christ, page 160
John Robert Walmsley Stott CBE (27 April 1921 – 27 July 2011), an Anglican cleric, was recognized as a leader in the worldwide Evangelical movement.
Stott was appointed a chaplain to Elizabeth II of the United Kingdom in 1959. He was one of the principal authors of the Lausanne Covenant in 1974. He received a number of honorary doctorates, as well as a Lambeth Doctorate of Divinity.
Even after his retirement in 1991, Stott continued to receive recognition. In 2005, Time magazine ranked him among the 100 most influential people in the world. He was appointed a Commander of the Order of the British Empire (CBE) in 2006.
The Cross of Christ is one of over 50 books he authored.
NOTE: The photo and biographical information are taken from Wikipedia.