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In Stoic philosophy, pneuma () is the concept of the "breath of life," a mixture of the elements air (in motion) and fire (as warmth).〔"Stoicism," ''Routledge Encyclopedia of Philosophy'' (Taylor & Francis, 1998), p. 145.〕 Originating among Greek medical writers who locate human vitality in the breath, pneuma for the Stoics is the active, generative principle that organizes both the individual and the cosmos.〔David Sedley, "Stoic Physics and Metaphysics," ''The Cambridge History of Hellenistic Philosophy'', p. 388.〕 In its highest form, the pneuma constitutes the human soul (''psychê''), which is a fragment of the pneuma that is the soul of God (Zeus). As a force that structures matter, it exists even in inanimate objects.〔John Sellars, ''Stoicism'' (University of California Press, 2006), pp. 98-104.〕 ==Levels of pneuma== In the Stoic universe, everything is constituted of matter and pneuma. There are three grades or kinds of pneuma, depending on their proportion of fire and air. * The pneuma of state or tension (''tonos''). This unifying and shaping pneuma provides stability or cohesion (''hexis'') to things; it is a force that exists even in objects such as a stone, log, or cup. The 4th-century Christian philosopher Nemesius attributes the power of pneuma in Stoic thought to its "tensile motion" (''tonicê kinêsis''); that is, the pneuma moves both outwards, producing quantity and quality, and at the same time inwards, providing unity and substance. An individual is defined by the equilibrium of its inner pneuma, which holds it together and also separates it from the world around it.〔Michael J. White, "Stoic Natural Philosophy (Physics and Cosmology)," p. 134, and Dorothea Frede, "Stoic Determinism," p. 186, both in ''The Cambridge Companion to the Stoics'' (Cambridge University Press, 2003).〕 * The pneuma as life force. The vegetative pneuma enables growth (''physis'') and distinguishes a thing as alive. * The pneuma as soul. The pneuma in its most rarefied and fiery form serves as the animal soul (''psychê''); it pervades the organism, governs its movements, and endows it with powers of perception and reproduction.〔John Sellars, ''Stoicism'', p. 91.〕 This concept of pneuma is related to Aristotle's theory that the pneuma in sperm conveys the capacity for locomotion and for certain sensory perceptions to the offspring.〔Friedrich Solmsen, "The Vital Heat, the Inborn Pneuma and the Aether," ''Journal of Hellenic Studies'' 77 (1957) 119–123.〕 A fourth grade of pneuma may also be distinguished. This is the rational soul (''logica psychê'') of the mature human being, which grants the power of judgment.〔John Sellars, ''Stoicism'', p. 105.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Pneuma (Stoic)」の詳細全文を読む スポンサード リンク
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