釋禪波羅蜜次第法門 5.126

5.126

二、明支義者，二禪有四支：一、內淨；二、喜；三、樂；四、一心。今明支義，例有通、別。支持、支離之義，類如前說。一、所言內淨支者，既離覺觀，依內淨心發定，皎潔分明，無有垢穢，故名內淨支。二、喜支者，定與喜俱發，行者深心自慶，於內心生喜、定等十種功德善法故，悅豫無量，故名喜支。三、樂支者，行者受於喜中之樂，恬澹悅怡，綿綿美快，故名樂支。四、一心支者，受樂心息，既不緣定內喜樂，復不緣外念思想，一心不動，故名一心支。

Second, explaining the meaning of the factors: the second dhyāna has four factors: first, internal purity; second, prīti; third, sukha; fourth, ekāgratā. Now, in explaining the meaning of the factors, there are generally general and specific [aspects]. The meaning of 'supporting' and 'separating' factors is analogous to what was explained before. First, as for what is called the factor of internal purity: having detached from vitarka and vicāra, the samādhi manifests relying on the internally pure mind, luminous, distinct, and without defilement, and is therefore called the factor of internal purity. Second, as for the factor of prīti: samādhi manifests together with prīti; the practitioner deeply rejoices in himself, and because wholesome dharmas such as the ten kinds of merits of prīti and samādhi arise in the inner mind, he is immeasurably delighted, and it is therefore called the factor of prīti. Third, as for the factor of sukha: the practitioner experiences the sukha within prīti, tranquil and delighted, continuously sweet and pleasant, and it is therefore called the factor of sukha. Fourth, as for the factor of ekāgratā: the mind experiencing sukha subsides, neither taking the prīti and sukha within the samādhi as an object nor taking external thoughts and concepts as an object; the single mind is unmoving, and it is therefore called the factor of ekāgratā.