en_tn/heb/06/09.md

we are convinced

Even though the author uses the plural pronoun "we," he is most likely referring only to himself. Alternate translation: "I am convinced" or "I am certain" (See: rc://en/ta/man/translate/figs-pronouns)

about better things concerning you

This means they are doing better than those who have rejected God, disobeyed him, and now can no longer repent so that God will forgive them (Hebrews 6:4-6). Alternate translation: "that you are doing better things than what I have mentioned"

things that concern salvation

The abstract noun "salvation" can be stated as a verb. Alternate translation: "things that concern God saving you" (See: rc://en/ta/man/translate/figs-abstractnouns)