首楞嚴義疏注經 8.29

8.29

正性者，此殺盜婬性是罪故，復是生死根本性故。然飲酒合是助因，今為正性者，以過惡深於辛故。以火淨食者，以淺況深，生果尚須淨食，何況酒肉、婬盜殺妄。《涅槃》護譏嫌戒與性重等，故須防微，免致大過。

Regarding 'direct nature': killing, stealing, and lust are by nature offenses, and are furthermore by nature the root of birth and death. However, drinking alcohol should properly be an auxiliary cause, but is now treated as a direct nature because its faults and evils are deeper than those of the pungent roots. Regarding 'purify food with fire': using the shallow to illustrate the profound, even fresh fruits must be purified food, how much more so wine, meat, lust, stealing, killing, and lying? In the Nirvāṇa [Sūtra], the precepts against protecting against censure are equal to the major offenses of nature; therefore one must guard against the subtle to avoid incurring great faults.