¹ tn The noun ψυχή (yuch) is used 10 times in the Gospel of John and 2 times in 1 John; of these 6 of the uses in John and both in 1 John refer to a person’s “life” (as something that can be laid down). In John 10:24 and 12:27 the ψυχή is that part of a person where emotions are experienced; one’s ψυχή is held in suspense or deeply troubled. This is, in other words, the immaterial part of a person as opposed to his physical existence. A close parallel is found in Philo, Heir 58 (285): “nourished with peace, he will depart, having gained a calm, unclouded life…welfare in the body, welfare in the soul (ψυχή)…health and strength…delight in virtues.”

sn Just as it is well with your soul. The equivalent contemporary idiom would be to speak of ‘spiritual’ health as opposed to physical health. The author affirms that Gaius is indeed well off spiritually, and he prays that Gaius’ physical health would match his spiritual health, i.e., that Gaius would be as well off physically as he is spiritually. It is the spiritual health which is to be the standard by which one’s physical health is measured, not the other way round.

² sn Demetrius is apparently someone Gaius would have heard about, but whose character was not known to him. Thus the author is writing to Gaius to attest to Demetrius’ good character. It appears that Demetrius is coming to Gaius’ church and needs hospitality and assistance, so the author is writing to commend him to Gaius and vouch for him. It is difficult to know more about Demetrius with any certainty, but the author is willing to give him a powerful personal endorsement (We testify to him too). Demetrius may well have been the leader of a delegation of traveling missionaries, and may even have been the bearer of this letter to Gaius. The writing of letters of introduction to be carried along by representatives or missionaries in NT times is also attested in Paul’s writings (1 Cor 16:3).

³ tn The words “to him” are not in the Greek text, but are implied.