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We should live a life pleasing to the Lord, not out of obligation, but from a grateful heart.
Don't wait around for a grateful heart to resist sin through the Holy Spirit. Your obligation NOW is to not live according to the flesh. Of course it's far better and easier if you have a grateful heart, but not having one is hardly an excuse to not be obligated to live a life pleasing to the Lord.
This 'should' stuff has to go. You HAVE to walk in the Spirit. We are obligated by virtue of being born again and having the Holy Spirit to walk according to the Spirit.
If you do not walk according to the Spirit and don't leave your practice of sin behind you show that you are not born again. You'll still sin as a believer, but if you live in it like you did before you got saved then you don't have the salvation you think you have. John said it, not me.
Don't be deceived by this new grace doctrine in the church, people. Grace doesn't make it so you can be saved and live in your old practice and lifestyle of sin at the same time. There is a big difference between sinning as a believer and living in and practicing sin. You aren't saved if you're doing the latter.