Everyone has spoken well (testifies) of Demetrius [who is probably the one who brought this letter to Gaius].
Even the truth also agrees with this testimony.
[He lived as he taught, his life was consistent with the truth of the faith.] We too can attest (testify) to this,
and you know that our testimony is true.
[Three witnesses confirm Demetrius' character, see . The verb in the expression ‘all speak well of’ is in the perfect tense, indicating that the testimony about Demetrius had been given over a long period of time and was still valid. He is otherwise unknown. It is unlikely that the silversmith who was an opponent of the gospel is the same person, see . Demetrius was a common name at that time.]