成唯識論述記 4.433

4.433

述曰：下第八證，引《四食經》。識食既成，即第八識。謂佛初踰城出家，於外道尼乾子所學修苦行。由彼外道懸頭拔髮，自餓投巖，故佛六年日食麻麥。既知非道便棄捨之，牧牛女邊受乳糜食，受吉祥草，詣菩提樹，於其後夜便證菩提。彼外道等見受乳糜，遂生誹謗言：破我戒。復聞證得無上菩提，伺佛晨朝入城乞食，便往試佛先詣城門。既見如來便為問曰：言證一法，世不能知，請為具陳，其義何者？佛欲除彼無義苦行乃報之曰：一切有情皆依食住，正覺正說，餘不能知。外道咲曰：愚者亦解，何言正覺？深生誹謗，此經即是彼時所說，大小二乘皆共信有。雖總言食，破彼自餓，意許四種，無一有情一剎那中無四食者。即遍三界、五趣、四生，其中識者即阿賴耶，是因緣本。佛悟諸法密意說之，言雖在近，意在於遠。文段有三，一如上解。

The Commentary states: Below is the eighth scriptural proof, citing the Sūtra on the Four Nutriments. Once the nutriment of consciousness is established, it is precisely the eighth consciousness. When the Buddha first leaped over the city wall to go forth, he studied and practiced austerities among the Nirgrantha non-Buddhists. Because those non-Buddhists hung upside down, pulled out their hair, starved themselves, and threw themselves from cliffs, the Buddha for six years ate a single grain of hemp and wheat each day. Having realized this was not the path, he abandoned it, accepted milk-rice from the cowherd girl, accepted auspicious grass, went to the Bodhi tree, and in the latter part of the night attained enlightenment. When those non-Buddhists saw him accepting the milk-rice, they gave rise to slander, saying, 'He has broken our precepts.' Further hearing that he had attained unsurpassed awakening, they watched for the Buddha entering the city in the morning to beg for food, and went ahead to the city gate to test him. Having seen the Tathāgata, they asked him, saying: 'You claim to have realized a single Dharma that the world cannot know; please expound it fully, what is its meaning?' Wishing to eliminate their meaningless austerities, the Buddha replied to them: 'All sentient beings abide by sustenance; this is the true realization and true exposition, which others cannot know.' The non-Buddhists laughed and said: 'Even fools understand this; why call it true realization?' They gave rise to profound slander. This sūtra is precisely what was expounded at that time, and both Mahāyāna and Hīnayāna jointly believe in its existence. Although it speaks generically of sustenance to refute their self-starvation, in intent it admits four kinds, such that not a single sentient being in a single instant is devoid of the four nutriments. That is, it pervades the three realms, the five destinies, and the four modes of birth. Among them, consciousness is the ālaya[vijñāna], which is the root of causes and conditions. The Buddha, having awakened to all dharmas, spoke of it with implicit meaning; although the words are immediate, their intended meaning is profound. The text has three sections, the first being explained as above.