釋禪波羅蜜次第法門 7.69

7.69

九、心作喜者，此對二禪內淨喜。所以者何？二禪喜從內淨發，以無智慧照了多受也。今觀此喜，即知虛誑不生受著，如真實知生法喜，亦名喜覺分。既從正觀，心生真法喜，故名心作喜。

Ninth, causing the mind to rejoice: this corresponds to the joy of internal purity of the second dhyāna. Why is this? The joy of the second dhyāna arises from internal purity, but lacking the illumination of wisdom, it is mostly experienced with attachment. Now contemplating this joy, one immediately knows it to be deceptive and does not give rise to experiential attachment; knowing according to reality gives rise to Dharma joy, which is also called the awakening factor of joy. Since true Dharma joy arises in the mind from correct contemplation, it is called causing the mind to rejoice.