俱舍論頌疏論本 30.26

30.26

釋曰：孔雀輪有青、黃等一切別，此一切種由何因感？如是因相非餘境界，唯佛能知。色差別因尚為難了，況心、心所諸無色法因緣差別豈易了知？

Explanation: The circle of a peacock's feather has all kinds of distinctions, such as blue, yellow, and so on. By what causes are all these varieties produced? Such characteristics of causes are not within the domain of others; only a Buddha can know them. Even the causes of the differentiations of form are difficult to understand, how much more could the distinct causes and conditions of formless phenomena, the mind and mental factors, be easy to comprehend?