妙法蓮華經玄義 9.159

9.159

會迹顯本者，此則就行。尋迹中諸行，或從此佛行行得記，或從彼佛行行得記，或示己身他身，隨機應現長短大小。諸迹悉從本垂，若結會古今，還結迹而顯本耳。本迹雖殊，不思議一。文云：「諸善男子！於是中間，我說然燈佛等，又復言其入於涅槃，如此皆是方便分別。」即會迹顯本意也。

'Converging the traces and revealing the original source' concerns practice. Investigating the various practices among the traces, either one practiced practices and received prophecy from this buddha, or one practiced practices and received prophecy from that buddha, or he manifested his own body or another's body, appearing long or short, large or small according to spiritual capacity. All traces are suspended from the original source; if one integrates and converges past and present, one simply integrates the traces to reveal the original source. Although original source and traces differ, their inconceivable [nature] is one. The text says: 'Good sons! In the interim, I spoke of Dīpaṃkara Buddha and others, and furthermore said that they entered nirvāṇa; all such things were distinctions of expedient means.' This is precisely the meaning of converging the traces and revealing the original source.