大毘盧遮那成佛經疏 2.60

2.60

第卅一「云何鼠心？謂思惟斷諸繫縛」者，如鼠見他箱篋繩係等，輒好非理損壞，亦不作念：「由斷此故，令我得如是利。」但爾無趣為之。此心亦爾，所有繫屬及與成事，好為間隙而爼敗之。

The thirty-first: "What is the rat mind? It is thinking of cutting through all bindings." Just as a rat, upon seeing others' boxes, cases, cords, ropes, and the like, is habitually fond of damaging them without reason, and does not think: "By cutting through this, I will obtain such-and-such benefit," but simply does so pointlessly; this mind is also like this: it is fond of finding cracks to ruin and spoil whatever belongs to others and whatever has been accomplished.