But we can never change enough to impress God. And here's the reason: trying to impress God, others, or ourselves puts us at the center of our change project. It makes change all about my looking good. It is done for my glory. And that's pretty much the definition of sin. Sin is living for my glory instead of God's.
Tim Chester, You Can Change: God's Transforming Power for Our Sinful Behavior and Negative Emotions
change, living-for-god-s-glory, sin