The
images of auditory and visual symbols in the growth of speech replace in
our minds concrete images and they permit of abstract thought. It is
dependent primarily upon the ear, an organ of exquisite feeling, whose
sensations are infinite in number and in kind. This sensory receptor with
its cerebral perceptor has in the long process of time, aided by vision,
under the influence of natural laws of the survival of the fittest,
educated and developed an instrument of simple construction (primarily
adapted only for the vegetative functions of life and simple vocalisation)
into that wonderful instrument the human voice; but by that development,
borrowing the words of Huxley, "man has slowly accumulated and organised
the experience which is almost wholly lost with the cessation of every
individual life in other animals; so that now he stands raised as upon a
mountain-top, far above the level of his humble fellows, and transfigured
from his grosser nature by reflecting here and there a ray from the
infinite source of truth." Thought in all the higher mental processes could
not be carried on at all without the aid of language.
Written language probably originated in an analytical process analogous to
the language of gesture.
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