大般涅槃經義記 4.189

4.189

喻中，先喻如來密語，「有智臣」下喻智能解。前中「告臣先陀婆來」總喻密語，「王」喻如來，「臣」喻菩薩，「先陀」喻佛一切密語，非有所局。下別顯之。於中，初先牒總開別，次列四名，「如是」下結。先陀，山名，於此山中出好鹽、器、水、馬等事，將處目事，是故四種同名先陀。

In the simile, first the Tathāgata's secret words are illustrated by a simile; from "There is a wise minister..." onward illustrates that wisdom is able to understand. In the former part, "Told the minister, 'Bring saindhava'" generally illustrates secret words: the "king" illustrates the Tathāgata; the "minister" illustrates the bodhisattva; "saindhava" illustrates all secret words of the Buddha and is not limited to anything specific. Below, it reveals them separately. Therein, first it reiterates the general and opens into the particulars; next it lists the four names; from "Such as..." downward concludes. Saindhava is the name of a mountain; this mountain produces fine salt, vessels, water, horses, and so forth; using the place to refer to the things, these four kinds therefore share the same name, saindhava.