大毘盧遮那成佛經疏 2.78

2.78

第四十九「云何毒藥心？謂順修無生分法」者，毒謂龍蛇藥草諸惡毒也。如人中毒悶絕，轉趣死地，無有生分。此人心亦爾，不生善心亦不生惡心，乃至一切心不能生起，但任運而行，漸入無因無果中，故名無生分法也。行人自覺知已，應發起大悲眾善，離斷滅空，即是所謂甘露妙藥。

As for the forty-ninth, “What is the poison-like mind? It refers to conforming to and practicing dharmas devoid of a factor for life”: “Poison” refers to the various virulent poisons of dragons, snakes, and herbs. Just as a poisoned person faints, progressively heading toward the state of death without any factor for life, this person's mind is also like this: they neither generate a good mind nor an evil mind, up to being unable to generate any mind at all. Merely acting spontaneously, they gradually enter into [a state of] having no cause and no effect; hence it is called “dharmas devoid of a factor for life.” Once practitioners have recognized this themselves, they should generate great compassion and the multitude of goods, abandoning the emptiness of annihilation; that is the so-called wondrous medicine of amṛta.