At daybreak Jesus went out to a solitary place. The people were looking for him and when they came to where he was, they tried to keep him from leaving them. But he said, "I must preach the good news of the kingdom of God to the other towns also, because that is why I was sent." And he kept on preaching in many synagogues. (Luke 4: 42-43)

"Because that is why I was sent." Another translation reads, "for this is is my purpose." The Greek - apostello houtos - is literally sent for this, or them or these, the pronoun's meaning must be surmised from context.

Jesus might have been sent to preach the good news of the kingdom of God, or he might have been sent for the other towns, or to the inhabitants of the other towns. I suppose he might have meant all these purposes.

At Capernaum Jesus had done very good work, found friends and followers, and was appreciated by many. But he was aware of a broader calling. It is not clear if Jesus knew what lay beyond Capernaum. But he was ready to take the risk to find out.

Above is Jesus calling Peter and Andrew by Duccio di Buoninsegna. Peter and Andrew were residents of Capernaum.