首楞嚴義疏注經 4.419

4.419

命是報法，依業所引。第八識種連持色心不斷功能，名之曰命。前六見聞元一本識，由六根異，遂成分離。識用雖分，體唯一種，斯則同中立異、異處見同，同異失準互相交織，於總報體便立命根，名為命濁，即業繫苦相也。上之五重，皆由能、所妄覺影明，展轉相習，從細至麁互為形待，次第轉生，混真成濁，有此五義耳。

Life span is a retribution dharma, induced on the basis of karma. The seed of the eighth consciousness, which has the function of continuously sustaining body and mind without interruption, is termed 'life span'. The preceding six [functions of] seeing and hearing originally constitute one fundamental consciousness; due to the differences among the six sense faculties, they become divided. Although the functions of the consciousnesses are separated, their substance is only a single seed. Thus, within identity they establish difference, and in places of difference they see identity; identity and difference losing their standard, they intertwine with each other, and on the basis of the body of total retribution, the life faculty is established. This is called the turbidity of life span, which is the mark of suffering bound by karma. The five layers above are all formed through the mutual habituation of the subjective and objective deluded awareness and shadow-clarity; from subtle to coarse, they mutually condition each other, arising in succession and blending reality into turbidity. There are simply these five meanings.