The very first issue of the Watchtower said this. "We should learn to love and value truth for its own sake; to respect and honor it by owning and acknowledging it wherever we find it and by whomsoever presented. A truth presented by Satan himself is just as true as a truth stated by God. ... Accept truth wherever you find it, no matter what it contradicts. " Watchtower, July 1879, p 8, Headline: "What Is Truth?".
Here are a few examples of assumed 'truths' that are not true based on what the Bible says.