Charles Ellicott Commentary Isaiah 51:12

"I, even I, am he that comforteth you: who art thou, that thou art afraid of man that shall die, and of the son of man that shall be made as grass;" — Isaiah 51:12 (ASV)

I, even I. —The iterated pronoun emphasizes the true grounds of confidence. If God be with us, what matter is it who may be against us? The enemies are mortal and weak; the Protector is the Eternal and the Strong.