The procedures of science are largely determined by its pre-arranged categories. Freedom is needed for the truth; the scientists should not confuse his scientific life with his social one. The author points out that if men are attached to houses, they are much more attached to the ideas built up by their education. Truth will come out, but many times its champions do it more harm than good. "Of course, it is important to be right, but to be right in the right way rather than in the wrong way. Some people are so violently right in the wrong way as almost to turn the truth into an error." One believes what he wishes. Those who disagree with him are stupid. "If prejudice is as common an affliction as I have suggested certainly I must have a goodly share of it and my prejudice must have colored my treatment of this theme as the prejudice of others colors their themes." (PsycINFO Database Record (c) 2006 APA, all rights reserved)