Be good, have courage, says the stoic sage in a lesson for the ages.

Officia sua vir bonus exequetur inconfusus, intrepidus.

A good man will perform his duties undaunted and fearlessly.

Officia (duties) is the nominative plural form of "officium."

Sua (his own) agrees with "officia."

Exequetur (will perform) is the third person singular future passive indicative of "exequi."

Inconfusus (undaunted or unashamedly) in the nominative singular masculine form

Intrepidus (fearlessly) in the nominative singular masculine form