An excerpt from this excellent book written by Dr. John MacArthur at the end of the introduction page says this,
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Why did God save you? Paul says it was “according to the good pleasure of his will, to the praise of the glory of His grace” (Ephesians 1:5–6). Above all else, God chose to save you for His own glory. As your spiritual journey continues, you’ll see yourself reflecting more and more of that glory in your life. Second Corinthians 3:18 says, “But we all, with unveiled face, beholding as in a mirror the glory of the Lord, are being transformed into the same image from glory to glory, just as by the Spirit of the Lord.” It is my prayer that this book will help you along that ever-transforming path.
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Grace to you.