金光明經文句記 4.47

4.47

二、「涅槃」下，示四門相。亦色非色，雙亦門也。非色非非色，雙非門也。

Second, from 'Nirvāṇa' onward demonstrates the characteristics of the four gates. Both form and non-form is the gate of both. Neither form nor non-form is the gate of double negation.