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The first value of correct teaching is that it purges the seeker of many errors in understanding. This purgation in its turn saves him from committing many errors in conduct. Here is its practical value. The second value is that its light instantly exposes imposture, charlatanry, exploitation, or evil in other teachings and in their exponents.
-- Notebooks Category 7: The Intellect > Chapter 2 : The Service of Intellect > # 33