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If God made it so easy for us as some imply, then how would we make our bodies a "living sacrifice". Sacrifice is never easy and it isn't supposed to be. Sacrificial living is loving God in action not words or a false notion of being perfect. The true mark of a believer/disciple is in the struggle....doing something your flesh doesn't want to do or not doing something your flesh wants to do. That is living victoriously and those are the victories that Jesus loves because it shows you love Him.....and when I fail, disciplines me as a loving father would not by shame or punishment, but picking me up out of my pit and putting His arms around me and saying that He loves me even in my failure.
Some do struggle more than others when it comes to their sinful ways, and no believer changes over night.
It is a process that the Lord through the Holy Spirit will do the molding in our lives to change us from walking in darkness to walking in light (righteousness). If we claim as some are doing that we continue to sin every single day, then we would be saying the Holy Spirit is failing to work in our lives. Or the flip side would be that this form of thinking stems from, would be denying the help and guidance of the Holy Spirit.
None of us are completely sinless as some like to continue to falsely spout out, but there is a difference in being sinless and abstaining from sins to where you do not sin everyday. Will we sin again? YES Can we abstain from sinning everyday? YES It is not a lie nor is it false teaching to teach this, as some state.