瑜伽論記 4.384

4.384

總約伏斷出五現見體，故云此總略體性。別釋中，初二觀論有兩番釋：初番云、初不淨觀正是念住，以方便念住而為依止；第二不淨觀即後念住，以初念住而為依者，第二不淨觀者，此約所依加行根本緣起差別，顯二不淨觀，初緣不淨後骨人故。

Generally stating the essence of the five direct perceptions in terms of subduing and severing, it therefore says 'this is their general, summarized intrinsic nature'. In the individual explanations, regarding the first two contemplations, the treatise has two sets of explanations: The first set states: The first contemplation of impurity is precisely the foundation of mindfulness, having the preparatory foundation of mindfulness as its support; the second contemplation of impurity is the subsequent foundation of mindfulness, having the first foundation of mindfulness as its support. The 'second contemplation of impurity' demonstrates the two contemplations of impurity in terms of the differences in the causal conditioning of the preparatory and root stages on which they rely, since the first takes impurity as its object and the latter takes the skeleton.