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Commentary on the Contemporary Issue
The Method of Doubt
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A. J. Ayer absolute action aesthetic answer appear argument Aristotle become believe called Categorical Imperative cause civil disobedience claim concept condition consider Crito definition deny Descartes desire determined doctrine drugs duty effect empirical ethical evidence evil existence experience express fact false feelings give Glaucon happen happiness human Hume hypotheses ideal ideas individual Jerome Lettvin judge judgment Kant kind knowledge labour Leibniz liberty logical marijuana matter means mental illness merely metaphysics mind miracle moral nature never normative ethical objects obligation observation opinion particular person phenomena philosophers Plato pleasure political possible principle probable problem produce proposition proposition h psychic question rational reality reason relation religion religious scientific self-love sense social society Socrates soul suppose synthetic proposition theory things thought Timothy Leary tion true truth understanding universal validity words wrong