ANSWER: That because of his divine nature his obedience and suffering would be perfect and effective; and also that he would be able to bear the righteous anger of God against sin and yet overcome death.
In catechism questions 22 and 23 we are looking at the work of our truly human and truly divine Redeemer, Jesus Christ. What is the theological term we use when talking about Christ bearing the punishment for our sins and satisfying the wrath of God? (Hint: It begins with the letter "A."**) If we believe that Christ's death was a necessary sacrifice, what does that tell us about God's view of sin? How does the author of the letter to the Hebrews explain Christ's sacrifice in Hebrews 10:1-18?
Do you think it is difficult for human beings to accept that Jesus is truly God? Take a look at the story of the paralyzed man who is delivered to Jesus by his friends (see Matthew 9:1-8, Mark 2:1-12, and Luke 5:17-26). How do the scribes and Pharisees react? Why do you think they were outraged by Jesus' claims?
In contrast to the scribes and Pharisees, how does the Apostle Paul describe Jesus' divinity in Colossians 1:15-23? If you list Christ's roles and attributes using this passage, how many items do you get?
**For a good explanation of this term, see "Sacrifice" in J. I. Packer's Concise Theology and also the series "The Atonement in the Old Testament" on Ed Stetzer's The Exchange blog.