佛遺教經論疏節要 1.197

1.197

甘露是諸天長生之藥。忍力既成，則益法身、延慧命，故以忍受惡罵喻飲甘露。不由彼辱，寧顯我忍？猪揩金山，喻意可識。苟不如是，則無證道智慧，名凡夫愚人。

Ambrosia is the medicine of longevity of the devas. Once the power of forbearance is accomplished, it benefits the dharmakāya and prolongs the wisdom-life; hence enduring malicious abuse is compared to drinking ambrosia. If not for their humiliation, how could my forbearance be revealed? The meaning of the simile of a pig rubbing against a gold mountain can be understood from this. If it is not so, one lacks the wisdom that realizes the Dao and is called an ordinary, foolish person.