This compound adjective describes those who are taught by God himself, not merely by human instructors. It combines θεός (God) with διδακτός (taught), creating the beautiful concept of divine instruction. Paul uses it only once, referring to believers who have been directly taught by God to love one another. The term implies direct divine pedagogy—the Spirit's internal instruction rather than external human teaching alone. It echoes Isaiah's prophecy that God's people would all be taught by the Lord, a promise Jesus applied to his disciples.