諸經要集 3.71

3.71

第一念佛者。專精念佛。如來形相功德具足。身智無崖周旋往來。皆具知之。修行一法自致涅槃。不離念佛便獲功德。是名念佛。

"First, mindfulness of the Buddha: single-mindedly contemplate the Buddha, with the Tathāgata's bodily marks and virtues fully complete, his body and wisdom boundless, and in his circumambulations and coming and going, know them all completely. Practicing this one dharma leads of itself to nirvāṇa; not departing from mindfulness of the Buddha, one promptly obtains merits. This is called mindfulness of the Buddha.