俱舍論記 20.17

20.17

「已依聖教至識亦應無」者，釋有境故。以理而言，要必有境識乃得生，無則不生其理決定。若去、來無，是則應有無所緣識，所緣無故識亦應無。

Regarding "Having relied on the holy teaching ... consciousness would also not exist": this explains "because consciousness has an object". In terms of reason, only when there is necessarily an object can consciousness arise; if there is none, it does not arise—this principle is definitive. If past and future do not exist, there would be a consciousness without an object; because there would be no object, consciousness would also not exist.