But the theory of evolution will have nothing
to do with any development but physical; or at any rate with mental
development except as the result of physical: it knows nothing of pure
mind, or spiritual existence, or anything of the sort.
In the nature of things we can have neither observation nor experiment
in this stage. We cannot by any process develop the lower mind of an
animal into the higher mind of man, and prove the steps of the
evolution.[1] It is important to remember that the power of _directing
the attention by a voluntary process of abstraction_, is one that
distinctively belongs to man. It is an effort of will, of a kind that no
animal has any capacity for. By it alone have we any power of abstract
reasoning, and it is intimately concerned with our self-consciousness
and memory, and with our language. I am quite aware that animals possess
something analogous to a language of their own; they can indicate
certain emotions and give warning, and so forth, to their fellows. But
that language could never develop into human language, or the animal
will (such as it is) ever rise to a human will, or animals become
endowed with self-consciousness, unless they could acquire the power of
voluntarily abstracting the mind from one subject or part of a subject
and fixing the attention on another.
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