Theophylact of Ohrid
Catena Aurea · Markusevangelium 6
And he went out from thence, and came into his own country; and his disciples follow him. And when the sabbath day was come, he began to teach in the synagogue: and many hearing him were astonished, saying, From whence hath this man these things? and what wisdom is this which is given unto him, that even such mighty works are wrought by his hands? Is not this the carpenter, the son of Mary, the brother of James, and Joses, and of Juda, and Simon? and are not his sisters here with us? And they were offended at him. But Jesus said unto them, A prophet is not without honour, but in his own country, and among his own kin, and in his own house. And he could there do no mighty work, save that he laid his hands upon a few sick folk, and healed them. And he marvelled because of their unbelief.
Or again, if the prophet has noble relations, his countrymen hate them, and on that account do not honour the prophet. There follows, And he could there do no mighty work, &c. What, however, is here expressed by He could not, we must take to mean, He did not choose, because it was not that He was weak, but that they were faithless; He does not therefore work any miracles there, for he spared them, lest they should be worthy of greater blame, if they believed not, even with miracles before their eyes. Or else, for the working of miracles, not only the power of the Worker is necessary, but the faith of the recipient, which was wanting in this case: therefore Jesus did not choose to work any signs there. There follows, And he marvelled at their unbelief.