God demonstrated his own love for us in this: While we were still sinners, Christ died for us. Romans 5:8
“The highest act of love is the giving of the best gift, and, if necessary, at the greatest cost, to the least deserving. This is what God did. At the cost of his Son’s life, to the totally undeserving. God gave the best gift.”
John Piper in God is the Gospel (Wheaton: Crossway, 2005) 139.