說無垢稱經疏 6.142

6.142

贊曰：下廿對，舊有九對，通諸善惡，令生欣厭。此有三對。受所學者，初所受戒。持別解脫者，受持戒。或初遮戒，後是性戒。或後是初時，初捨惡故；初是後時，領所受故。翻上二可知。此應作者，作持之戒。非應作者，止持之戒，或作犯之戒。

Commentary: Below are twenty pairs (formerly nine pairs) covering all goods and evils to generate aspiration and revulsion. Here there are three pairs. "Observing what is learned" refers to the precepts initially received. "Upholding individual liberation (prātimokṣa)" means receiving and upholding the precepts. Or, the former refers to prohibitive precepts and the latter to intrinsic precepts. Or, the latter refers to the initial stage because it initially relinquishes evil; the former refers to a subsequent stage because it encompasses what has been received. Reversing the above two can be understood. "What ought to be done" refers to the precepts of active observance. "What ought not to be done" refers to the precepts of passive restraint, or the precepts concerning violations by action.