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離五欲,出家學道,既捨世樂,未得定樂,或
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時心生憂念,如魚樂水。心相如是,常求
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樂事,還念本所欲。行者多生是二心,是故
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佛說「當除貪、憂」。說「貪」,即是說世間喜,以
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相應故。初觀不淨者,人身不淨,薄皮覆故,
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先生淨相,後生餘倒;以是故,初說不淨觀。
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復次,眾生多著貪欲,取淨相;瞋恚、邪見不
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爾故,是以先治貪欲,觀不淨。念身四威儀
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等者,先欲破身賊;得一心人,所為之事皆
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能成辦。以是故先尋繹其身所為、所行、來
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去、臥覺、坐禪觀身所作,常一心安詳,不錯
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不亂。作如是觀察,以不淨,三昧易得。身
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雖安詳,內有種種惡覺觀,破亂其心;以是
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故,說安那波那十六分以防覺觀。安那般
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那義,如先說。身既安詳,心無錯亂,然後
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行不淨觀,安隱牢固。若先行不淨觀,狂心
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錯亂故,不淨反作淨相。佛法中,此二法名甘
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露初門。不淨觀者,所謂菩薩摩訶薩觀身如
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草木瓦石無異。是身外四大變為飲食,充
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實內身:堅者是地,濕者是水,熱者是火,動者
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是風;是四事入內即是身。是四分中,各各無
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我、無我所,隨逐自相,不隨人意。苦、空等亦
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如是說。「若坐、若立」者,臥則懈怠,身不動故,
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心亦不動;行則心亂,身不靜故,心亦不靜。
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欲以眼見事況所不見,故說譬喻:「牛」即
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是行者身,「屠兒」即是行者,「刀」是利智慧,「奪牛
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命」即是破身一相,「四分」即是四大。屠者觀
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牛四分,更無別牛,亦非是牛;行者觀身四
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大亦如是。是四大不名為身。所以者何?此
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