John Calvin on Isaiah 41:11

11. 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 making any mention of enemies, various thoughts and anxieties might have arisen in their minds. God indeed promises that we shall be saved, but 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? To the general promise, therefore, there is likewise added this circumstance: “Though the enemies flourish, yet they shall at length be driven back, covered with shame and disgrace.” Salvation is therefore promised on this condition, that we must, in the meantime, encounter enemies and maintain various contests with them, that we may not promise to ourselves external peace, for we must incessantly carry on war.