And they were astonished at his teaching, for he taught them as one who had authority, and not as the scribes.
This demoniac was probably one of that multitude, which was mentioned, a little before, by Matthew 4:24. Yet the narrative of Mark and Luke is not superfluous: for they relate some circumstances, which not only present the miracle in a more striking light, but also contain useful instruction.
Here is, I. A general account of Christ's preaching in Galilee. John gives an account of his preaching in Judea, before this (ch. 2 and 3), which the other evangelists had omitted, who chiefly relate what occurred in Galilee, because that was least known at Jerusalem. Observe, 1. When Jesus began to preach in Galilee; After that John was put in prison.
Commenting on Mark 1:14-22
And they were astonished at his doctrine,.... The nature and importance of it, it being what they had not been used to hear; only at best the doctrine of the law, and sometimes only the traditions of the elders, or an allegorical and traditional sense of the Scriptures, and things very trifling and unedifying: and also they were amazed at the manner of his preaching...