RobH_en_tn/2ti/04/05.md

be sober-minded

Paul wants his readers to think correctly about everything, and he speaks about them as if he wanted them to be sober, that is, not drunk with wine. Alternate translation: "think clearly" (See: rc://en/ta/man/translate/figs-metaphor)

the work of an evangelist

This means to tell people about who Jesus is, what he did for them, and how they are to live for him.