Adam Clarke on Isaiah 42:25

The fury of his anger "The heat of his wrath" - For חמה chammah, the Bodl. MS. has חמת chammath, in regimine, more regularly.

It hath set him on fire round about - So thoroughly hardened are the Jewish people, that they are represented as being in a house on fire, and even scorched with the flames, without perceiving their danger, or feeling that they are hurt! What a picture of mental induration! and this is their state to the present day. But by whom shall Jacob arise? for in this sense he is small indeed. Many efforts have been made to Christianize them, but without effect; and is this to be wondered at, while we tell them how great they are, how learned, how wise, how much we owe to them, that they are still the peculiar people of God, etc., etc.? If all this be true, what can they gain by becoming Christians? Whereas a more stupid, proud, hardened, ignorant people can scarcely be found in the civilized world, and they are most grossly ignorant of their own Scriptures.