Romans 3:7-8 : But if the truth of God through my lie abounded unto his glory, why am I also still judged as a sinner? The Jew regarded Christianity as a lie and that Paul's preaching it made it his lie, and that in forsaking Judaism for Christianity he committed about the greatest sin that a Jew could commit. Paul is here adopting the objector's method of reasoning. If you justify your sins on the grounds that your sins brought out and displayed God's righteousness, why condemn me for what you consider my great sin? On that theory, "why not (as we are slanderously reported, and as some affirm that we say), let us do evil, that good may come?" If the theory stated in the objection were correct, then the more we sin, the better it would be for us. But Paul adds that the condemnation of such slanderers is just.