翻譯名義集 2.220

2.220

【Cakravāka】 This translates as mandarin duck; a paired bird. When resting, they mate; when flying, they go as a pair. The "Chapter on Bird Parables" says: "The first is the kālindi; the second is the mandarin duck. They roam and alight together, never parting from one another." The present Master explains: "The male exemplifies permanence; the female exemplifies impermanence. Because saṃsāra contains inherent goodness, impermanence is identical with permanence, just like the two birds below. Because nirvāṇa contains inherent evil, permanence is identical with impermanence, just like the two birds flying high. Thus, whether high or low, male and female are together, roaming in pairs and resting side by side, and the meaning is fully accomplished in both."