*Buddhapashcimavavadopadesha 1.24

1.24

經曰：此五根者心為其主，是故汝等當好制心。心之可畏，甚於毒蛇惡獸怨賊大火越逸，未足喻也。動轉輕躁，但觀於蜜不見深坑。譬如狂象無鉤、猨猴得樹，騰躍踔躑難可禁制。當急挫之，無令放逸。縱此心者，喪人善事；制之一處，無事不辦。是故比丘！當勤精進折伏汝心。

The Sūtra says: "These five senses have the mind as their master; therefore, you all should properly control your minds. The fearsomeness of the mind exceeds that of venomous snakes, ferocious beasts, vengeful bandits, or rampant raging fire—none of these suffice as a simile. It is restless and fickle, looking only at the honey and failing to see the deep pit. It is like a mad elephant without an ankuśa, or an ape that has reached the trees: leaping and bounding, difficult to restrain. You must swiftly curb it and not let it be indulgent. If you indulge this mind, you will ruin human wholesome deeds; restrain it in one place, and there is nothing that cannot be accomplished. Therefore, bhikṣus, you should strive with diligence to subdue your minds."