God is absolute - He is independent of the world that He made. He always existed, while everything created had a beginning. Not only in its beginning, but in its continuation, each created being is dependent on God. God, by contrast, does not need anything from the world (Acts 17:24-25).
It has often been suggested that God's mysterious name "I am who I am" (Exodus 3:14) expresses his independence. Who He is depends only on Himself, not anything outside of Him. Though this idea of independence and self-sufficiency is not the only implication of God's name, the idea of independence is confirmed further in Exodus 33:19.
God's grace depends not on qualities in the recipients, but on God's choice, as the apostle Paul sees in Romans 9:9-18. Paul quotes from Romans 9:15 and then sums it up: "So then it depends not on human will or exertion, but on God, who has mercy". The reliability of God's whole character, on which Moses and the people of Israel depend, has the firmest possible grounding. God Himself is the ultimate basis for confidence and trust.