集諸經禮懺儀 2.13

2.13

The third is the gate of mental recollection and contemplation: that is to say, with an exclusive mind, recollecting and contemplating the bodily marks and light of that Buddha and all the noble multitude, the adornments of the land, and so forth. As the Contemplation Sūtra says, except only when sleeping, one constantly recollects, constantly remembers, constantly envisions, and constantly contemplates these matters. Hence it is called the gate of contemplation.