[Sidenote: Importance of Differentiation]
It is impossible to develop a particular quality fully if you only
recognize its _likenesses_ to other qualities. _Real mental development
is accomplished only as a result of the recognition of differences_.
After studying twins for a year, you still might be unable to tell them
apart if you were impressed solely with their remarkable similarity to
each other. Another man, with a mind discriminatively and restrictively
trained to recognize differences, would learn in five minutes to
distinguish the individualities of the twins.
Almost phenomenal development can be attained by use of the
discriminative-restrictive training method. The minutest distinctions
can be perceived if one concentrates his practice for mental growth on
the recognition of _differences only_. Individuals who have lost one
or more senses become extraordinarily adept in detecting contrasts with
their other senses. A normal man, possessed of all his senses, is
capable of even greater development of his powers of differentiation.
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