'He told them, "This is what is written: The Christ will suffer and rise from the dead on the third day, and repentance and forgiveness of sins will be preached in His name to all nations, beginning at Jerusalem..."'
The gospel of Jesus Christ is repentance and forgiveness:
Not condemnation, but hope.
Not death, but life.
Not lawfulness, but relationship.
One of the things the scribes took issue with was Jesus forgiving sins (Matthew 9.1-6), because they believed only God had power to forgive sins, but if Jesus was who He claimed to be, the son of God (Luke 22.70) and the Christ (Matthew 16.16-17), then He had full right to forgive sins.
And that's what He came to earth to do. He came to bridge the gap between the sinful and the sinless. So He came to Earth, still God, in the form of a man, so that He could walk among us and make God real to us, make God personal. He came to Earth to save us.
Do you know where something similar happened? Joseph.
Joseph was fully human (you can tell by his behaviour), and when he dreamt of his future and all that was to come, instead of keeping it hush-hush as Jesus did (Matthew 16.20, Mark 8.30, Luke 9.21), he went around boasting about it.
He wasn't lying though. His brothers were going to bow down to him (Genesis 37.7-11). So after he told them all that he had dreamt they 'disposed of him', rather like what happened to Jesus with his crucifixion. And they thought that was the end of it.
"But what they didn't know was that what they had meant for evil, God had meant to be their own salvation (Genesis 50.20)."
You see without Joseph being thrown in a well, he wouldn't have been sold to Ishmaelites, which would have meant he wouldn't have been a slave in Potiphar's house in Egypt, which in turn would mean that he wouldn't have been accused of rape, which would mean he wouldn't have ended up in jail, which would have meant that he wouldn't have been there to decipher the meanings of the dreams of the baker and cupbearer, which would have meant that he wouldn't have been able to decipher the King's dream, which would mean that he wouldn't have been able to save Egypt and the surrounding lands (including the land of Canaan where all his brother's lived), which would have meant that his whole family would have died.
In much the same way, if God was not merciful, then He would not have sent His son Jesus (who was both God and man) to be crucified, which would mean He (Jesus) wouldn't have taken the cost of all our sins, and if He hadn't taken the penalty for all our sins which is death (Romans 6.23a), we would all be facing eternity without God, Hell, rather than having what we now have (should we want it), the gift of eternal life in Christ Jesus (Romans 6.23b).
Hey guys, use this website http://www.blueletterbible.org/index.cfm to look up all the verses that I have mentioned. Just type each of them into the search bar at the top and choose a version you think you will find easiest to understand. The version I have used for my quotes here is the NIV.