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The usual considered, nuanced reponse from LR. I think even a thorough-going Calvinist who believed in OSAS (which I am not and don't) would say that the sign of being saved is a sincere attempt to live morally. You might slip from time to time, and need to repent, but someone who went around stealing, fornicating and bullying and thought it was ok because he was saved and couldn't lose their salvation would get short shrift from a Calvinist, who would say that they are not really saved at all. That attitude is called antinomianism, and it is generally regarded as a serious error. St Augustine of Hippo may have said "Love God and do as you please", but the catch is that loving God comes first, and if you do love God, you will want to do what pleases God.