妙法蓮華經玄義 2.139

2.139

為利根故，亦是有因緣故，宜須如此。時眾如快馬見鞭影，不俟徹骨耳。如此追泯，何說而不寂耶！

Because of sharp faculties, and also because there were conditions, it was suitable to be like this. The assembly at that time was like a swift horse seeing the shadow of the whip, not waiting for it to penetrate to the bone. When retrospectively eliminated like this, what discourse would not be silenced!