For Jacob my servant's sake, &c. The prophet here gives us the reasons why God showed such favour to a prince, who had been addicted to the superstition of his country, and ignorant of the true God, that he prospered all his undertakings, and gave success to all his endeavours. It was, 1st, For Israel's sake: For Israel, mine elect, I have even called thee, &c. I have called thee to this honour, and that by name; not for thy own sake, but for Israel's sake: therefore, neither despise them, though a poor and despised people, nor be puffed up in a great opinion of thyself. I have surnamed thee, though thou hast not known me I knew and called thee, when thou didst neither know nor think of me; nay, when thou hadst no being. I girded thee, &c. I made thee strong and active, and fitted and disposed thee for these great and warlike enterprises. It was, 2d, For the sake of all nations; that they might be convinced of the true divinity and almighty power of the God of Israel. That they may know from the rising of the sun, &c., that I am the Lord, &c. That all nations may know it by my foretelling these things so long before, and by the wonderful success that I shall give thee, and by my overruling thy heart and counsels, to the deliverance of my people. Or, as Lowth explains it, “My interposing so visibly in behalf of my own people, and returning their captivity by such unexpected means, will convince the heathen part of the world that I am the only true God.”
Related Commentaries of Isaiah 45:4
Isaiah 45:4-6
4 For Jacob my servant's sake, and Israel mine elect, I have even called thee by thy name: I have surnamed thee, though thou hast not known me.
5 I am the LORD, and there is none else, there is no God beside me: I girded thee, though thou hast not known me:
6 That they may know from the rising of the sun, and from the west, that there is none beside me. I am the LORD, and there is none else.