The reason God saves has nothing to do with the worthiness or performance of those He saves. So why does He do it? He makes His purposes clear.
Then I said I would pour out my wrath upon them and spend my anger against them in the midst of the land of Egypt. But I acted for the sake of my name, that it should not be profaned in the sight of the nations among whom they lived, in whose sight I made myself known to them in bringing them out of the land of Egypt. So I led them out of the land of Egypt and brought them into the wilderness. Ezekiel 20:8-10
Of his own will he brought us forth by the word of truth, that we should be a kind of firstfruits of his creatures. James 1:18
Page after page, Ezekiel lays out the case against Israel and Judah. Their sin and unfaithfulness before a Holy God is an abomination. God would have been just and right to destroy them at the first failure, but He extended patience and relented again and again. Why? Three times in chapter 20, He says “I acted for the sake of my name, that it should not be profaned” (vs. 9,14, 22). Another time He says “And you shall know that I am the Lord, when I deal with you for my name’s sake, not according to your evil ways, nor according to your corrupt deeds, O house of Israel, declares the Lord God.” (v.44). The basis of God showing them mercy was the glory of His name–that His name not be profaned and that Israel should know that He is the Lord.
God showing mercy to His elect people benefits us in two ways. One, the world can see (if we are willing to) that He is able to save His wayward sheep. Two, His people come to know Him in truth. James sheds more light on the subject when he writes that “Of his own will he brought us forth by the word of truth, that we should be a kind of firstfruits of his creatures.” Why did God save His people? Because He wanted to. It was of His own will. God has no constraints. He has no obligations. He is completely free. He can do what He wants consistent with His holiness. What did He want to do? He wanted to save a people for Himself, the beginning of a new creation.
Think about it
God wanted to save His elect people and that is what He did. Are you one of His? If so, marvel at the greatness of His grace and mercy to you. Remember, you are secure in Him because the reason God saves has nothing to do with you.