
Upaya (Sanskrit: {IAST|upāya}, expedient means, pedagogy) is a term used in Mahayana Buddhism to refer to an aspect of guidance along the Buddhist Paths to liberation where a conscious, voluntary action is driven by an incomplete reasoning around its direction. Upaya is often used with kaushalya (कौशल्य, `cleverness`), upaya-kaushal.....
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http://en.wikipedia.org/wiki/Upaya

any device, as a koan, used for purposes of instruction.
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https://www.infoplease.com/dictionary/upaya
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