Roman 6
6 What shall we say, then? Shall we go on sinning so that grace may increase?
We save by grace through faith
Paul that teach that doctrine ask what is mean, is that mean go ahead on killing and robing the bank, without repent still save? Because salvation not by work
It seem Paul explain the reason he say we save under grace is not in purpose to encourage killing and robing but he explain in the next verse
2 By no means! We are those who have died to sin; how can we live in it any longer? 3 Or don’t you know that all of us who were baptized into Christ Jesus were baptized into his death? 4 We were therefore buried with him through baptism into death in order that, just as Christ was raised from the dead through the glory of the Father, we too may live a new life.
Grace is for a group and only for a people that died for sin, hate sin.
Grace is only for those that baptism unto dead like Christ and born again, not for people that enjoy sinning.