法華玄論 10.60

10.60

答：四等中喜謂慶前人脫苦得樂，隨喜門通隨一切聖凡所作功德而喜，此義不同，但四等要是定心，今通定散。又四等中喜但據脫苦果故喜，今通隨喜因果也。七覺中喜是無漏，隨喜門通漏無漏；禪支中喜是定心但是喜受，今通也。五受中喜是果報，今是因門。彼是自悅，今是慶他。彼是無記，今是善法也。

Answer: Joy among the four immeasurables means celebrating another person's liberation from suffering and attainment of joy; the gate of rejoicing in accord generally follows along and rejoices in whatever merit is performed by all noble ones and ordinary people—this meaning is different. Moreover, the four immeasurables must be concentrated minds, whereas the present [rejoicing] covers both concentrated and distracted minds. Furthermore, joy among the four immeasurables rejoices solely on the basis of the fruition of escaping suffering, whereas the present [rejoicing] covers rejoicing in accord with both causes and fruitions. Joy among the seven factors of awakening is without outflows, whereas the gate of rejoicing in accord covers both with and without outflows. Joy among the dhyāna factors is a concentrated mind and is solely the feeling of joy, whereas the present [rejoicing] is broader. Joy among the five feelings is retribution, whereas the present [rejoicing] is the causal gate. That is delight in oneself; this is celebration of others. That is indeterminate; this is a wholesome dharma.