en_tn/tit/02/02.md

to be temperate

"to be sober-minded" or "to be self-controlled"

temperate, dignified, sensible, sound

"temperate and dignified, to control their desires, and to be sound"

sound in faith, in love, and in perseverance

Here the word "sound" means to be firm and unwavering. The abstract nouns "faith," "love," and "perseverance" can be stated as verbs. Alternate translation: "and they must firmly believe the true teachings about God, truly love others, and continually serve God even when things are difficult" (See: rc://en/ta/man/jit/figs-abstractnouns)