He could not
have built up the ability of a prune tree to produce _delicious_ fruit
if he had not fed into the tree structure, or instrument of production,
a sufficient quantity and high quality of the _particular plant foods of
deliciousness_. He restricted his experimental prune trees to the
development of specific delicious qualities, by giving them no food
except that _discriminatively_ selected for his purpose. That is, he
made them develop in one way and in one way only, when he was making a
particular test.
Similarly, as has been stated before, you can develop the specific _man_
qualities you need to succeed. You must _feed_ to a particular mind
center, through the related brain center, _selected sense impressions_.
These can come only from the coordinated set of _muscles_ governed by
that mind-brain center. Then you should _exercise_ the specific brain
center and set of muscles in the production of mental reflexes, or the
mind fruit. Acts of courage, for example, are the fruit of brave
thoughts.
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