大方廣圓覺修多羅了義經略疏 1.676

1.676

一向絕緣，的不擬犯，名曰堅持。防禁根門，誡約身口，故名禁戒。戒品雖多，統為三聚：一攝律儀、二攝善法、三攝眾生。今意說律儀，義通餘二。律儀戒者，謂十無盡，取要而言即唯四重，此四清淨，則一切枝葉不生。

Exclusively severing external conditions and resolutely having no intention to violate them is called 'firmly upholding'. Guarding the sense gates and restraining body and speech is called 'prohibitive precepts'. Although categories of precepts are many, they are subsumed under three clusters: first, precepts of restraint; second, precepts of accumulating good dharmas; third, precepts of benefiting sentient beings. Here the intention is to speak of the precepts of restraint, but the meaning extends to the other two. Precepts of restraint refer to the ten inexhaustible precepts; to take the essentials, they are just the four major offenses. When these four are pure, all branches and leaves do not arise.