Jehovah's view on the need to examine one's religion evidently changed in the years betwen 1969 and 1981.
W69 1/15: "Faith, to be like a rock-mass, must be based on truth. It must be clearly defined in one’s mind, solidly established on accurate knowledge and facts. Such a faith will stand up to questions and opposing viewpoints. Our faith should be a God-given faith. But how can we be sure? As 2 Corinthians 13:5 says, “Keep testing whether you are in the faith, keep proving what you yourselves are.” Yes, we have to keep testing and examining our faith: Is it logical, is it reasonable, does it harmonize with the book of faith, the Bible?"
W69 3/15: "We need to examine, not only what we personally believe, but also what is taught by any religious organization with which we may be associated. Are its teachings in full harmony with God’s Word, or are they based on the traditions of men? If we are lovers of the truth, there is nothing to fear from such an examination."