首楞嚴義疏注經 9.29

9.29

二禪三天又勝下位，故名勝流。以得極喜，故云一切憂愁所不能逼。初禪雖得喜支，極喜未生，在身麁故，但得離苦，猶有憂喜相對；今此二禪定水潤心，慧光明泰，喜支調適，憂愁不生，名為定生喜樂地也。麁漏已伏者，忻上厭下但名為伏，以不斷故不名無漏。然此一地具四支林：一內淨、二喜、三樂、四一心，行相如常。

The three heavens of the second dhyāna are again superior to the lower stages, hence called "superior streams." Because they have attained supreme joy, it is said, "cannot be oppressed by any sorrow or anxiety." Although the first dhyāna obtains the factor of joy, supreme joy has not yet arisen; because it is coarse in the body, it merely achieves freedom from suffering, while sorrow and joy still stand in opposition. Now in this second dhyāna, the water of meditative absorption moistens the mind, the light of wisdom is bright and tranquil, the factor of joy is harmonious, and sorrow and anxiety do not arise; this is called the stage where joy and bliss are born of meditative absorption. "Coarse outflows have already been subdued": aspiring to the upper and reviling the lower is merely called subduing; because they are not severed, it is not called uncorrupted. However, this single stage possesses a grove of four factors: first, internal clarity; second, joy; third, bliss; and fourth, one-pointedness of mind; their characteristics are as usual.