What Was Jesus' First Teaching"

This Sunday's reading from Matthew 4:12-23 tells us about the start of Jesus; ministry,

Now when Jesus heard that John had been arrested, he withdrew to Galilee. He left Nazareth and made his home in Capernaum by the lake, in the territory of Zebulun and Naphtali, so that what had been spoken through the prophet Isaiah might be fulfilled: ‘Land of Zebulun, land of Naphtali,   on the road by the sea, across the Jordan, Galilee of the Gentiles— the people who sat in darkness   have seen a great light,and for those who sat in the region and shadow of death   light has dawned.’From that time Jesus began to proclaim, ‘Repent, for the kingdom of heaven has come near.’* As he walked by the Sea of Galilee, he saw two brothers, Simon, who is called Peter, and Andrew his brother, casting a net into the lake—for they were fishermen. And he said to them, ‘Follow me, and I will make you fish for people.’ Immediately they left their nets and followed him. As he went from there, he saw two other brothers, James son of Zebedee and his brother John, in the boat with their father Zebedee, mending their nets, and he called them. Immediately they left the boat and their father, and followed him. 

 Jesus went throughout Galilee, teaching in their synagogues and proclaiming the good news of the kingdom and curing every disease and every sickness among the people.

Mark's Gospel contains this parallel,

Now after John was arrested, Jesus came into Galilee, proclaiming the gospel of God, and saying, “The time is fulfilled, and the kingdom of God is at hand; repent and believe in the gospel.” Mark 1:14-15 

I fear we who know the forgiving grace of God all too easily forget Jesus' first teaching, that we must  "Repent!"

Nowadays. people only repent when they get caught doing something wrong, and then many fail to do so.

God, who hears our every thought, catches us in need of repentance many times a day.

Jesus saw that too.