with the mind's general development. From the point of view of
language, thought may be defined as the highest latent or potential
content of speech, the content that is obtained by interpreting each of
the elements in the flow of language as possessed of its very fullest
conceptual value. From this it follows at once that language and thought
are not strictly coterminous. At best language can but be the outward
facet of thought on the highest, most generalized, level of symbolic
expression. To put our viewpoint somewhat differently, language is
primarily a pre-rational function. It humbly works up to the thought
that is latent in, that may eventually be read into, its classifications
and its forms; it is not, as is generally but naïvely assumed, the final
label put upon, the finished thought.

Most people, asked if they can think without speech, would probably
answer, "Yes, but it is not easy for me to do so. Still I know it can be
done." Language is but a garment! But what if language is not so much a
garment as a prepared road or groove? It is, indeed, in the highest
degree likely that language is an instrument originally put to uses
lower than the conceptual plane and that thought arises as a refined
interpretation of its content. The product grows, in other words, with
the instrument, and thought may be no more conceivable, in its genesis
and daily practice, without speech than is mathematical reasoning
practicable without the lever of an appropriate mathematical symbolism.
No one believes that even the most difficult mathematical proposition is
inherently dependent on an arbitrary set of symbols, but it is
impossible to suppose that the human mind is capable of arriving at or
holding such a proposition without the symbolism. The writer, for one,
is strongly of the opinion that the feeling entertained by so many that
they can think, or even reason, without language is an illusion. The
illusion seems to be due to a number of factors. The simplest of these