I am glad of the coming of Stephanas and Fortunatus and Achaicus: for that which was lacking on your part they have supplied.
Fortunatus and Achaicus - probably of Stephanas' household. Fortunatus and Achaicus - probably of Stephanas' household.
That which was lacking on your part. So far as you were unable yourselves to 'refresh my spirit,' being absent from me, "they have supplied" by coming to me, and so supplying means of conversation between you and me. They probably carried this letter back; see the subscription below: hence, the exhortations 1 Corinthians 16:16; 1 Corinthians 16:18, as though they would be at Corinth when the letter arrived.