New Living Translation
Everyone speaks highly of Demetrius, as does the truth itself. We ourselves can say the same for him, and you know we speak the truth.

American Standard Version
Demetrius hath the witness of all men , and of the truth itself: yea, we also bear witness: and thou knowest that our witness is true.

Berean Study Bible
Demetrius has received a good testimony from everyone, and from the truth itself. We also testify for him, and you know that our testimony is true.

Douay-Rheims Bible
To Demetrius testimony is given by all, and by the truth itself, yea and we also give testimony: and thou knowest that our testimony is true.

English Revised Version
Demetrius hath the witness of all men, and of the truth itself: yea, we also bear witness; and thou knowest that our witness is true.

King James Bible
Demetrius hath good report of all men, and of the truth itself: yea, and we also bear record; and ye know that our record is true.

World English Bible
Demetrius has the testimony of all, and of the truth itself; yes, we also testify, and you know that our testimony is true.

Young's Literal Translation
to Demetrius testimony hath been given by all, and by the truth itself, and we also -- we do testify, and ye have known that our testimony is true.

3 John 1:12 Additional Translations ...