瑜伽師地論略纂 6.73

6.73

「又有四種能得正見乃至專注一緣」者，於境不順，不貪也；於境不違，不瞋也；正知而行，不癡也。此之三種行，緣諸境行正行時清淨。專注一緣，正念也，後一種住時清淨也。

"Furthermore, there are four kinds that are able to attain right view up to one-pointed concentration": Not conforming to an object is non-greed; not conflicting with an object is non-anger; acting with clear comprehension is non-delusion. These three kinds of practice are pure when acting with right practice toward the various objects. Focusing on a single object is right mindfulness; this final kind is pure when abiding.