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The ancient manuals of yoga say that meditation is not to be attempted where the people around are wicked, when the body is tired or sick, or when the mind is unhappy and depressed. The reason for these prohibitions is simply that these undesirable conditions will render the practice of meditation much more difficult and hence much more likely to end in failure.
-- Notebooks Category 4: Elementary Meditation > Chapter 2 : Place and Condition > # 107