"The time has not come for us to work as if there were no prejudice. Christ said: “Be ye therefore wise as serpents, and harmless as doves.” Matthew 10:16 . If you see that by doing certain things which you have a perfect right to do, you hinder the advancement of God's work, refrain from doing those things. Do nothing that will close the minds of others against the truth. There is a world to save, and we shall gain nothing by cutting loose from those we are trying to help. All things may be lawful, but all things are not expedient. 9T 215.1"
"Behold, I send you forth as sheep in the midst of wolves: be ye therefore wise as serpents, and harmless as doves."
Ellen White directly references Matthew 10:16 in this passage.