en_tn/rom/07/07.md

What will we say then?

Paul is introducing a new topic. (See: rc://en/ta/man/translate/figs-rquestion)

May it never be

"Of course that is not true!" This expression gives the strongest possible negative answer to the preceding rhetorical question. You may have a similar expression in your language that you could use here. See how you translated this in Romans 9:14.

I would never have known sin, if it were not through the law

Paul is speaking of sin as if it were a person who can act. (See: rc://en/ta/man/translate/figs-personification)

sin

"my desire to sin"