瑜伽論記 20.171

20.171

於中，先辨闕一不護，若護初戒能護餘二。後辨假實防護，以三因故名假，謂為令他知故非實防，隨順他故非實修，由他導故不得勝利，又此名實。

Within this, it first analyzes how lacking one means not protecting: if one protects the first precept, one is able to protect the other two. Later, it analyzes nominal and real guarding: because of three causes it is called 'nominal'—namely, guarding not genuinely because it is done to let others know; cultivating not genuinely because it merely conforms to others; and failing to obtain the supreme benefit because one is guided by others; whereas the opposite of this is called 'real.'