The human ability to think is tightly tied to the ability to
use words, symbols, and images. The
capacity to think is then related to the capacity in which we use instruments: words, symbols, images,
concepts, categories, definitions, etc.
The human being thinks through concepts. A concept is a classification that helps to
understand the world around. Man forms
concept to help him think with speed and clarity. Concepts are made for communication and the
success of that communication depends on the exactitude with which the concepts
agree with each other. Wrongly defined
words impede clear thinking.
Test
When studying, consistent criteria should be used to discern
the true from the false. We should
abandon all ordinary justifications and hold all knowledge under the most
rigorous test. It is this doubtful
attitude that should be placed before every test and all knowledge which we
should adopt and cultivate in our studies.
People ignore the evidence that contradicts their ideas, and
the more vigorously they sustain their ideas, the more reluctant they are to
accept the evidence. It is essential to
use all evidence available when study and weigh them out to reach all
conclusions and get the best of all of them.
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