法華義疏 2.243

2.243

「又見佛子未甞睡眠」下，第三、明六度無方行，頌上種種信解。言無方者凡有二義：一者、適緣所宜前後無定；二者、根性非一自行不同故也。明六度即六，初有一行明精進行，精進是眾德之本，菩薩聞此之事故發始即行也。《成實論》云「身心昏重曰睡，攝心離覺名眠」。《毘曇》云「別有睡眠數，睡著前境為睡，身心昏昧略緣境界曰眠」。大乘以一切住著昏闇皆名睡眠。菩薩心無染著名未甞睡眠，不動而遊行故曰經行也。念念常習無生正觀，故名精進也。

From "Again seeing sons of the Buddha who have never slept" below is the third, explaining the practice of the six perfections without fixed order, versifying the various beliefs and understandings above. "Without fixed order" has two meanings in general: first, according with what is fitting to conditions, the sequence is not fixed; second, because capacities and natures are not singular, one's own practice differs. Explaining the six perfections involves six [points]. First, there is one verse explaining the practice of vigor. Vigor is the root of all virtues; upon hearing of this matter, bodhisattvas practice it right from their initial setting out. The *Tattvasiddhi-śāstra* says, "Heaviness and torpor of body and mind is called drowsiness; collecting the mind to depart from awareness is called sleep." The *Abhidharma* says, "There is a distinct mental factor of sleep: falling asleep attached to an external object is drowsiness; torpor of body and mind with a diminished grasping of objects is called sleep." The Mahāyāna considers all abiding attachment and dark torpor to be sleep. The bodhisattva's mind being free of defiling attachment is called "never sleeping"; moving without agitation is called "walking meditation." Constantly practicing the correct contemplation of non-arising moment by moment is called "vigor."