Titus 2:14 who gave Himself for us, that He might redeem us from every lawless deed and purify for Himself His own special people, zealous for good works.
Christ did not give up a prophet or a king for us, He did not sacrifice the biggest goat or anything else; He gave His own life for us.
Christ knew there would be nothing on earth which would be good enough to pay for our sin debt and to purify us enough to be with God.
He also knew not all of us would give our lives back to Him or would choose to follow Him; but He still came forward for those of us who were willing to take that step forward with Him.