妙法蓮華經文句 10.106

10.106

「說是品」下，是第四，二土利益。三昧與陀羅尼，體一而用異，寂用為三昧、持用名陀羅尼。又色身變現名三昧、音聲辯說名陀羅尼。上品云「初得一切色身三昧轉身、得一切語言陀羅尼」，當知音聲猶是色法，故言體一用異。又舌根清淨名陀羅尼，餘根清淨名三昧，都是六根清淨法門耳。

From "When [the Buddha] spoke this chapter" onward is the fourth [section]: benefits in the two lands. Samādhi and dhāraṇī are identical in substance but different in function: quiescent function is called samādhi, while maintaining function is named dhāraṇī. Furthermore, transformation and manifestation of the physical body is named samādhi, while vocal eloquence is named dhāraṇī. The previous chapter says: "He first attained the samādhi of transforming the body into all physical forms and attained the dhāraṇī of all languages." One should know that vocal sound is still a material phenomenon; therefore it is said that their substance is identical while their functions are different. Moreover, purity of the tongue faculty is named dhāraṇī, while purity of the other faculties is named samādhi; all of these are simply dharma gates of the purity of the six faculties.