Romans 3:8

and why not (as we are slanderously reported, and as some affirm that we say), Let us do evil, that good may come? whose condemnation is just.

'and why not' -Paul says, 'In fact, some say the Gospel that. preach simply amounts to such, i.e. the more we sin, the more God is glorified and is seen as just.'

'do evil, that good may come' -a clear condemnation of the 'end justifies the means' type of argumentation.

'Whose condemnation is just' -'to condemn such men as these is surely no injustice' (NEB); 'such arguments are rightly condemned' (Mon). Paul will more fully show in Romans 6:1-8 that such is not the logical end of the gospel that he preaches.