When we sin, we directly or indirectly cause others to sin too and our sin becomes more serious than we think. So we need to be concerned about not only our own, but also all souls. All the more we need to be blameless before God. You can't regard sinning to be your own business, for it offends God and the whole heaven knows about it. Then, keep sinning and you not only draw others away from God, you get yourself condemned in the end as well. God wants to save you and the whole world, so let him turn you into a saint. It'll be so easy for him to accomplish that, once you give him the full green light.