“And he said unto them, I must preach the kingdom of God to other cities also: for therefore am I sent.”
Luke 4:43 — Greek Interlinear
Church Fathers on Luke 4:43
When he had bestowed sufficient favor upon the people by miracles, it was necessary for Him to depart. For miracles are always thought greater when the worker is gone, since they themselves are then the more heeded, and have in their turn a voice; as it is said, But when it was as day, he departed, and went.
He went also into the desert, as Mark says, and prayed; not that he needed prayer, but as an example to us of good works.
But if the sun-setting mystically expresses the death of our Lord, the returning day denotes His resurrection, (the light of which being made manifest, He is sought for by the multitudes of believers, and being found in the desert of the Gentiles He is held back by them, lest He should depart;) especially as this took place on the first day of the week, on which day the Resurrection was celebrated.