Albert Barnes Commentary Isaiah 45:5

"I am Jehovah, and there is none else; besides me there is no God. I will gird thee, though thou hast not known me;" — Isaiah 45:5 (ASV)

I am the Lord ... - (see the notes at Isaiah 42:8; Isaiah 43:2; Isaiah 44:8; Isaiah 45:14, Isaiah 45:18, Isaiah 45:22).

I girded thee ... - (see the note at Isaiah 45:1). The sense is, I girded you with the belt—the military belt; I prepared you, and strengthened you for war and conquest. Even people who are strangers to the true God are sustained by him, and are unable to accomplish anything without his providential aid.