"Do not make prominent those features of the message which are a condemnation of the customs and practices of the people, until they have an opportunity to know that we are believers in Christ, that we believe in His divinity and in His pre-existence. Let the testimony of the world's Redeemer be dwelt upon. He says, “I Jesus have sent Mine angel to testify unto you these things in the churches.” [ Revelation 22:16 .] ... GW 405.3"
"I Jesus have sent mine angel to testify unto you these things in the churches. I am the root and the offspring of David, and the bright and morning star."
Ellen White directly references Revelation 22:16 in this passage.