This essay supports the dictum of Gordon Allport: "All books on the psychology of personality are at the same time books on the philosophy of personality." The "hidden philosophy" is here considered at two points. First, the choice of objective method (restricting, when not excluding the use of introspective data) did in fact lay man on a Procrustean bed and cut off the data of conscious experience that only persons can supply. To justify this procedure on the grounds that publicity is "scientifically" desirable, overlooks the fact that public observation and agreement presuppose that at least two conscious persons report on what they see and can agree. "Publicity" does not exclude private awareness. The erect of the first hidden philosophical bias is especially serious when psychologists deal with value-questions such as the definition of maturity and mental health. When psychologists disregard introspective reports, they are likely to consider biological survival the criterion of healthy personality. This leads to "might (survival value) makes right"-a conclusion that in fact undermines both impartiality in the search for truth and violates the moral insight that might as such never make right.