首楞嚴義疏注經 1.628

1.628

二、如來廣為開示，三：一、問悟客塵引其開解，二：一、如來問悟因由。

Second, the Tathāgata broadly instructs him, in three parts: first, asking about the awakening to the guest-dust to lead him to understanding; two parts: first, the Tathāgata asks about the cause of awakening.