For how do you know, wife, whether you will save your husband [by leading him to Christ]? Or how do you know, husband, whether you will save your wife [by leading her to Christ]?

You are giving thanks well enough [in a way that God is glorified], but the other person [who does not understand you] is not edified [and spiritually strengthened since he cannot join in your thanksgiving].

Well then, my beloved brothers, hold your ground, immovable; abound in work for the Lord at all times, for you may be sure that in the Lord your labour is never thrown away.