Paul answers rhetorical questions to emphasize that each point he is making is certainly true. (See: [[rc://en/ta/man/translate/figs-rquestion]])

## On what grounds? ##

"For what reason?" or "Why is boasting excluded?" or "Why can we not boast?"

## Of works? ##

"Is boasting excluded because we obey the law?"

## on the grounds of faith ##

"because we believe in Jesus"

## without ##

"apart from"