"Jesus was like us in every respect but one: he was without sin. Jesus had to be fully human to serve as our perfectly obedience representative. Just as Jesus had to be human to live in our place, he also had to be human to die in our place."- Wayne A. Grudem
Source: Grudem, Wayne A. Christian Beliefs: Twenty Basics Every Christian Should Know. Zondervan. Grand Rapids, MI. 2005. 68.