3 John 1:1 - Coke's Commentary on the Holy Bible

The well-beloved Gaius,— We read of one Gaius, of Corinth, Romans 16:23 who hospitably received St. Paul, when he went out to preach the gospel gratis; and if this were, as he seems to have been, the same, he was St. Paul's convert: nor is St. John's calling him his child, an argument to the contrary; since in the general he addresses all Christians in the same tender and affectionate style, agreeably to the sweetness of his temper, and suitably to his advanced years.