瑜伽論記 7.511

7.511

又非修習乃至尋復令心於內寂靜者，明非觀一死尸青瘀則觀二尸乃至一切相續別觀既不須觀，觀法云何？謂纔應於一尸骸青瘀起於勝解，尋復攝心不觀青瘀於內寂靜。次復進觀二尸青瘀還即於攝心不觀青瘀，乃至觀於一切青瘀還即攝心，於此所緣境相喜樂明淨無諸擾惱不強勵力齊爾時，應於如是尸骸發起勝解。

From "Moreover, it is not by cultivating... up to ...soon after, one again causes the mind to become inwardly tranquil": this clarifies that it is not that observing the blue-bruised state of one corpse means observing two corpses, and so on up to successively observing all corpses individually. Since one does not need to observe them in that way, what is the method of contemplation? That is, as soon as one arouses resolute intention regarding the blue-bruised state of a single corpse, one should immediately withdraw the mind, not observe the blue-bruised state, and become inwardly tranquil. Next, progressing further to observe the blue-bruised state of two corpses, one again immediately withdraws the mind and does not observe the blue-bruised state, up to observing all blue-bruised states and again immediately withdrawing the mind. When one finds joy, clarity, and purity in this focal mark, free of all agitation, without straining with effort—at that very point, one should arouse resolute intention regarding such corpses.