Thinking (n.) is a dialogue which the soul holds with itself about its object with the aim of constructing a sententially formulated opinion to be tested in dialogue with others.
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Thinking (n.) is a kind of doing that is no different than any other kind of activity demanding skill and abilities, practice, and experience gained over time.
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Thinking (n.) is a language, a conversation with oneself.
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Thinking (n.) is the achievement of truth through careful division or separation of ideas and things.
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Thinking (n.) is the talking of the soul with itself.