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體得名者,方便當體虛通,故名為門。實相亦爾。
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如言竹門板門也,當門體是竹板,故以當體
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得名也。問:此經有十五門,凡有幾城?答:五
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城也。〈信解品〉四城,〈化城品〉一城。〈信解品〉四城
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者,初即中止一城,即譬於一方垂應作佛,
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作佛為城也。二者於某城中捨吾逃走,譬背
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大乘之化,以大化為城也。三者昔在本城懷
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憂推覓,譬佛於法身地覓眾生大機不得,即
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佛法身為城也。四者時貧窮子到父住城,
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即大機已動,詺大乘理教為城也。五者〈化城
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品〉云「化作一城」,即二乘在三界外可以止息,
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喻之如城也。問:既有五城,凡有幾宅?答:凡
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有八宅。就火宅中凡有六宅,約義明之。初
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云有一大宅,二云其宅朽故,三是時宅主,
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四云是朽故宅屬于一人,五云長者諸子在
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此宅中,六云焚燒舍宅,七〈化城品〉云莊嚴
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舍宅,八〈安樂行品〉云賜以田宅。初兩序三界
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相貌,次兩明屬佛,後二明眾生在中更起煩
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惱受於八苦,後二譬小乘人諸子功德,下當
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說之。次論三說義。論曰「廣開三顯一,斷疑
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生信,為三根人三周說,初法說、次譬說、後宿
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世因緣說。」故三周說也。問:云何為三根人
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三周說耶?答:舊經師云初周為上根人說,
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次周為中根人說,後周為下根人說。評曰:
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直作此名,於文未善。若三說各為三根,三根
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各聞一說,則皆是上根,何名三品?設云上
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根聞一說、中根聞二說、下根聞三說者,則不
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應言法說為上根、譬說為中根、宿世為下根。
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今所明者,初周說通為三根,而上根一聞即
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