In the covenant, God becomes our God, and we are his people; and thereby all his attributes are ours also. And lest that we should doubt—when once our eyes are opened to see in any measure the inconceivable difficulty that is in this thing, what unimaginable obstacles on all hands there lie against us—that all is not enough to deliver and save us, God hath, I say, wrapped it up in this expression. Gen. 17:1, “I am,” saith he, “God Almighty” (all-sufficient) ;—”I am wholly able to perform all my undertakings, and to be thy exceeding great reward. I can remove all difficulties, answer all objections, pardon all sins, conquer all opposition: I am God all-sufficient.” Now, you know in whom this covenant and all the promises thereof are ratified, and in whose blood it is confirmed, to wit, in the Lord Christ alone; in him only is God an all-sufficient God to any, and an exceeding great reward.
– John Owen –
from Of Communion With God, volume 2 of Works, pages 93-94