The letter says Demetrius has testimony not only from people but also “from the truth itself.” In context, it presents his reputation as matching what is true and faithful (3 John 1:12).
In 3 John 1:11–12 the writer urges the “beloved” not to copy what is evil but to copy what is good. He links a person’s actions with what they really know and where they belong: doing good shows connection with God, while doing evil shows a lack of having seen God. These verses come after the letter contrasts Gaius’s faithful hospitality with Diotrephes’s harmful behavior and refusal to welcome traveling workers (3 John 1:5–10).
These verses draw a straight line between moral imitation and spiritual reality. The writer contrasts two patterns—“evil” and “good”—and says the community should take its cues from the good rather than copying the harmful example that has just been described in the letter (the conflict around refusing hospitality and harming others).
A common mistake is to turn the wording into a slogan. The better reading keeps the phrase tied to the passage, the speaker, and the problem the book is addressing.
Start with 3 John 1:12, then read the surrounding section so the answer stays connected to the passage's flow.
12Demetrius has the testimony of all, and of the truth itself; yes, we also testify, and you know that our testimony is true.