en_tn/gal/03/03.md

Are you so foolish?

This rhetorical question shows that Paul is surprised and even angry that the Galatians are foolish. Alternate translation: "You are very foolish!" (See: rc://en/ta/man/translate/figs-rquestion)

by the flesh

The word "flesh" is a metonym for effort. Alternate translation: "by your own effort" or "by your own work" (See: rc://en/ta/man/translate/figs-metonymy)