The kingdom of God is near. Repent and believer the good news

Mark 1:9-15
At that time Jesus came from Nazareth in Galilee and was baptized by John in the Jordan. As Jesus was coming up out of the water, he saw heaven being torn open and the Spirit descending on him like a dove. And a voice came from heaven: "You are my Son, whom I love with you I am well pleased."
At once the Spirit sent him out into the desert, and he was in the desert 40 days, being tempted by Satan.
After John was put in prison, Jesus went into Galilee, proclaiming the good news of God. "The time has come," he said. "The kingdom of God is near. Repent and believer the good news!
Galilee, though subject to Rome, was under the jurisdiction of  a 'native' ruler: Herod Antipas, one of Herod the Great's four sons. The region lay to the west of Lake Galilee. In Christ's day it was prosperous and densely populated, criss-crossed by Roman military roads and ancient trade routes-north, south, east and west.
Why?
Jesus was baptized by John, he do the man's role to accept baptize.
After John could not deliver message to others, Jesus come to deliver the good news. He played the role that God had planned.
Jesus experience 40 days temptation in desert, let him know how to face the pain and trouble of human being. So he may follow the command of the Lord.
Why?
Even Jesus has suffer 40 days tempted in desert, so we may suffer some trouble and difficult in the world, which may let us grow up in Spirit.