In the beginning _images_ how images originate in the mind must be explained. Then _words,_ applied to images. Finally _concepts,_ possible only when there are words--the assembling of several pictures into a whole which is not for the eye but for the ear (word). The small amount of emotion which the "word" generates,--that is, then, which the view of the similar pictures generates, for which one word is used,--this simple emotion is the common factor, the basis of a concept. That weak feelings should all be regarded as alike, _as the same,_ is the fundamental fact. There is therefore a confusion of two very intimately associated feelings in the _ascertainment_ of these feelings;--but who is it that ascertains? _Faith_ is the very first step in every sensual impression: a sort of yea-saying is the _first_ intellectual activity! A "holding-a-thing-to-be-true" is the beginning. It were our business, therefore, to explain how the "holding-of-a-thing-to-be-true" arose! What sensation lies beneath the comment "true"? 507. The _valuation_, "I believe that this and that is so," is the essence of "truth." In all valuations, the conditions of _preservation_ and of _growth_ find expression. All our _organs and senses_ of knowledge have been developed only in view of the conditions of preservation and growth. The _trust_ in reason and its categories, the trust in dialectics, and also the _valuation_ of logic, prove only that _experience_ has taught the usefulness of these things to life: not their "truth." The prerequisites of all living things and of their lives is: that there should be a large amount of faith, that it should be possible to pass definite judgments on things, and that _there should be no doubt_ at all concerning all essential values. Thus it is necessary that something should be assumed to be true, _not_ that it _is_ true. "The _real_ world and the world of _appearance_"-- I trace this contrast to the _relation of values._ We have posited _our_ conditions of existence as the _attributes of being_ in general. Owing to the fact that, in order to prosper, we must be stable in our belief, we developed the idea that the real world was neither a changing nor an evolving one, but a world of _being._ _(e)_ The Origin of Reason and Logic. 508. Originally there was chaos among our ideas. Those ideas which were able to stand side by side remained over, the greater number perished--and are still perishing. 509. The kingdom of desires out of which logic grew: the gregarious instinct in the background. The assumption of similar facts is the first condition for "similar souls." _For the purpose of mutual understanding and government._ 510.