It follows from the innate necessity of the perception that objects and their extrinsic and intrinsic causes are resolved into living subjects, and are classified in a hierarchy of specific types, which are accepted by the primitive and ignorant mind as the universal mythical forms.[26] But the necessities of human speech, which is however involved in mythical representations, from the very beginning essentially reflex, require other terms than those of individual and specific animations. It is clear that the simple personifying faculty of the intellect sufficed in its earliest emotions, but that after the slow development of psychical reduplication, and the enlargement of languages and ideas, it no longer satisfied the logical requirements of the mind. Consequently, explicit,--that is, rational--singular, and specific ideas gradually arose and assumed a definite form; they were interwoven and fused into these individual and specific types, and thus obtained a place in the thoughts and language of primitive man. The gradual intrusion of specific rational ideas is natural to the human mind, since it is logically progressive, and the fact may be observed by those who watch the mental growth of children, and of ignorant and untaught adults. While the mythical intelligence continues as before to give its habitual mythical interpretation of many natural phenomena, the use is gradually acquired of special and generic symbols which express special and specific ideas, and these no longer include a personification of the individual thing or idea. Without this intrusion of rational ideas any progress would be impossible, as well as the power of expressing all which time and education present to the mind, and gradually enable it to comprehend; the fanciful image is fused in a rational conception, which is, however, not yet definite and explicit.