John Calvin Commentary Isaiah 41:11

"Behold, all they that are incensed against thee shall be put to shame and confounded: they that strive with thee shall be as nothing, and shall perish." — Isaiah 41:11 (ASV)

Lo, all shall be ashamed and blush. Here the Prophet expressly promises assistance to the Jews against their enemies; for if he had merely promised safety without mentioning enemies, various thoughts and anxieties might have arisen in their minds.

God indeed promises that we will be saved, yet our adversaries prevail and treat us with the utmost scorn and cruelty; where then is that salvation which was so freely and abundantly promised?

Therefore, to the general promise, this element is also added: though the enemies flourish, they will eventually be driven back, covered with shame and disgrace.

Salvation is therefore promised on this condition: that in the meantime, we must encounter enemies and engage in various conflicts with them, so that we do not expect external peace, for we must incessantly wage war.