nesses_ 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.

You know how remarkably a blind man learns to "see" with his fingers
and ears. But need you lose the sense of sight before you can comprehend
the lesson of his example to you? You realize that you appear to lack
many essential qualities of success. Know now that these are all merely
_dormant_ in you. They can be awakened and developed to an
extraordinary degree if you train yourself consciously in the
discriminative-restrictive use of all your sense tools. You would do it
if you were blind. It certainly should be much easier to accomplish the
desired transformation with your eyes open to aid your other senses.

[Sidenote: Whatever You Lack Now You Can Develop]

The significance of all this is that you need not be permanently
handicapped in your sales-_man_-ship by any present lack of particular
qualifications for success. _It makes no difference what you happen to
be short of now_. By properly coordinating your brain-mind-muscle sets
or centers, and by using all three in the processes of your development,
_you can make yourself over almost miraculously_. Will power, courage,
exact and wise judgment, persistence, patience, rapid thinking,
constructive imagination--_any and all qualities you want_ CAN be
developed in you, even though they now seem not to exist.

Your development is limited only by the practically limitless number of
unawakened cells in your brain. Most of your potential mind centers are
asleep yet. _You can wake up the slumberers with your various sense
muscles, and vigorously exercise them