妙法蓮華經玄義 3.153

3.153

圓教增數行者，如《文殊問經》明菩薩修一行三昧，當於靜室，結跏趺坐，繫緣法界，一念法界，一切無明顛倒永寂如空。此之一行，即是一切無礙人，一道出生死，一切諸法中，皆以等觀入，解慧心寂然，三界無倫匹，此乃一行攝一切行。

As for progressive practice in the perfect teaching, it is as the Mañjuśrīparipṛcchā-sūtra explains the bodhisattva cultivating the samādhi of one practice: one should sit cross-legged in a quiet room, bind the attention to the dharma realm, and in a single thought [focus on] the dharma realm, so that all ignorance and error are eternally quieted like empty space. This single practice is that 'whereby all unimpeded people emerge from birth and death along the single path; among all phenomena, they enter through equal contemplation; their minds of understanding and wisdom are tranquil, without equal in the triple world.' This is a single practice subsuming all practices.