For there is no man. — His course of action seems to them to contradict His personal claim. It is opposed, they think, to the common-sense conduct of mankind.
If thou do these things. — The emphasis is on these things. There is no doubt that He does them; but if the acts themselves are such as they seem to be, and establish the claim which He bases on them, they should be done in Jerusalem, not in the villages of Galilee. They are for the world, and not for the retirement of home.