If we are not careful, we believers can easily become legalistic in our approach to living for God. I've attended churches in the past who were right on doctrinally. I could go down the list and go, "Yep, yep, yes, that's right" etc., but in numerous cases, the people themselves were somewhat cold, legalistic in their approach to service and to God. Why? I believe it's because they failed to recognize the connection between having a heart of flesh (created by God), which more naturally prompts a person to live accordingly versus doing things with little to no desire but doing them because you should. There is a world of difference between these two things.