釋禪波羅蜜次第法門 3.41

3.41

二、水輪者，水有二義：一、潤漬生長；二、體性柔軟。行者於地輪中若證水輪三昧，即是發諸禪種種功德，定水潤心，自覺心中善根增長，即是潤漬義。因得定故，身心濡軟，折伏高心，心隨善法，即是柔軟義，故名水輪。

Second, the water-wheel: Water has two meanings: first, moistening and growing; second, its nature is pliable. If within the earth-wheel the practitioner realizes the water-wheel samādhi, this is the arousal of the various virtues of the dhyānas; the water of concentration moistens the mind, and one naturally perceives the wholesome roots within the mind increasing and growing, which is the meaning of 'moistening'. Because absorption is attained, body and mind are soft and compliant, subduing haughtiness, and the mind follows wholesome dharmas, which is the meaning of 'pliable'; hence it is called the water-wheel.