What then? (ti oun?). Another turn in the argument about the excess of grace. Shall we sin? (amarteswmen?). First aorist active deliberative subjunctive of amartanw. "Shall we commit sin" (occasional acts of sin as opposed to the life of sin as raised by epimenwmen th amartiai in verse 2 Corinthians 1 )? Because (oti). The same reason as in verse 2 Corinthians 1 and taken up from the very words in verse 2 Corinthians 14 . Surely, the objector says, we may take a night off now and then and sin a little bit "since we are under grace."