Matthew 13:56

Thus the Lord is held in no honour by His own; and though the wisdom of His teaching, and the power of His working raised their admiration, yet do they not believe that He did these things in the name of the Lord, and they cast His father's trade in His teeth. Amid all the wonderful works which He did, they were moved with the contemplation of His Body, and hence they ask, Whence hath this man these things? And thus they were offended in him.

"Is not this the carpenter's son?" The greater then the marvel, and the more abundant the ground of amaze. "Is not His mother called Mary, and His brethren James, and Joses, and Simon, and Judas? and His sisters, are they not all with us? Whence hath this man these things? And they were offended in Him." Seest thou that Nazareth was where He was discoursing? "Are not his brethren," it is said, "such a one, and such a one?" And what of this? Why, by this especially you ought to have been led on to faith. But envy you see is a poor base thing, and often falls foul of itself. For what things were strange and marvellous, and enough to have gained them over, these offended them.

And when they are mistaken in His Father, no wonder if they are also mistaken in His brethren. Whence it is added, Is not his mother Mary, and his brethren, James, and Joseph, and Simon, and Judas? And his sisters, are they not all with us?

This error of the Jews is our salvation, and the condemnation of the heretics, for they perceived Jesus Christ to be man so far as to think Him the son of a carpenter.