Q. 16
Why must he be a true and righteous man?
A.
He must be a true man because the justice of God requires that the same human nature which has sinned should pay for sin. He must be a righteous man because one who himself is a sinner cannot pay for others.
Scripture Romans 5:12-15 · 1 Peter 3:18 · Isaiah 53:9 · Hebrews 7:26-27
Q. 17
Why must he at the same time be true God?
A.
He must be true God so that by the power of his divine nature he might bear in his human nature the burden of God's wrath, and might obtain for us and restore to us righteousness and life.
Scripture Isaiah 9:6 · Isaiah 53:11 · Acts 20:28 · 1 John 1:2
Q. 18
But who is that Mediator who at the same time is true God and a true and righteous man?
A.
Our Lord Jesus Christ, who has been given to us for our complete redemption and righteousness.
Scripture 1 Timothy 2:5 · Matthew 1:21-23 · Luke 2:11 · 1 Corinthians 1:30
Q. 19
From where do you know this?
A.
From the holy gospel, which God himself first revealed in Paradise. Afterwards he had it proclaimed by the patriarchs and prophets, and foreshadowed by the sacrifices and other ceremonies of the law. Finally he had it fulfilled through his only Son.
Scripture Genesis 3:15 · Romans 1:1-3 · Hebrews 10:1 · Galatians 4:4-5