Well, the Lord does tell us to work out our salvation. Yes, we are saved, but wow, the junk we brought into that salvation--it needs to be healed, hoed out, brought to the surface so we can live the kind of life He's called us to live and to walk in the path he carved for us from the beginning of the world. We need to perform good works because we're TOLD to do it. Our old sin nature will keep us down and prevent us from being all He's called us to be. We need renewal because we leak! He tells Christians that if we lack the Holy Spirit, to ask Him for it and He will give it to us. I think it's a good idea to ask often, maybe daily, because we need renewal daily.
-A8