法界次第初門 1.106

1.106

Next to the twelve āyatanas, we elucidate the eighteen dhātus because deluded persons are equally confused about both nāma and rūpa; opening form yields ten, and separating nāma makes eight, combining to make the eighteen dhātus. They are universally called "dhātus" (jie) because jie has the meaning of distinct classification. Each of these eighteen dharmas has its distinct essence, and their meanings are never blended or confused; hence they universally receive the name "dhātu."