首楞嚴義疏注經 2.580

2.580

諸法名數不能盡言，但舉三科，自攝一切，故云乃至。三科者，謂蘊、處、界。今於處中別出六根，故有六入。此之三科乃是世間虛妄分別，幻因緣合假名為生，幻因緣離假名為滅，實無有體可生可滅。

The names and enumerations of all dharmas cannot be fully spoken; by citing only the three categories, everything is encompassed, hence it says 'up to.' The three categories refer to aggregates, sense bases, and realms. Here, within the sense bases, the six faculties are distinguished separately, hence there are the six entrances. These three categories are worldly vain discriminations; when illusory causes and conditions blend and join, it is conventionally called arising; when illusory causes and conditions separate, it is conventionally called ceasing. In reality there is no substance that can arise or cease.