John Calvin Commentary Isaiah 46:9

"Remember the former things of old: for I am God, and there is none else; [I am] God, and there is none like me;" — Isaiah 46:9 (ASV)

Remember the former things. This is an explanation of the previous statement; because he expresses more fully what he previously meant, that is, that God has testified of himself by sufficiently numerous proofs, and has shown what is his nature and greatness; and that not merely for two or three days, or for a few years, but at all times; because he had continued his benefits, and had unceasingly bestowed his grace upon them. Therefore, he infers that the manifestations of his divinity, being so clear, ought to prevent them from giving their hearts to another.

That I am God. In this passage, the particle כי (ki) does not mean for, but that, and introduces a clause which explains what goes before. Besides, as we have previously explained, God wishes not only that he may be acknowledged, but that he alone may be acknowledged; and therefore he wishes to be separated from all the gods which men have made for themselves, that we may fix our whole attention on him; because if he admitted any companion, his throne would fall or shake; for either there is one God or there is none at all.