佛說觀佛三昧海經 10.25

10.25

佛告阿難：「佛滅度後，佛諸弟子欲觀十方佛者，於念佛三昧中但知麁相，當自然知無量妙相。如是觀者是名正觀，若異觀者名為邪觀。得此觀者見佛無數不可限量，入此定者名見一切諸佛色身，亦得漸漸入三空門。遊此空者諸佛力故心不著空，於未來世當成阿耨多羅三藐三菩提，得不退轉，是名不忘菩提之心正順佛道。」

The Buddha said to Ānanda: “After the Buddha's parinirvāṇa, if disciples of the Buddha wish to contemplate the Buddhas of the ten directions, while in the buddhānusmṛti-samādhi they will only know the coarse marks, but they will naturally come to know the immeasurable wondrous marks. Contemplating in this way is called correct contemplation; if one contemplates otherwise, it is called false contemplation. One who attains this contemplation sees Buddhas beyond number and limit. One who enters this concentration is said to see the rūpakāyas of all Buddhas, and also gradually enters the three gates of emptiness. Roaming in this emptiness, through the power of the Buddhas one's mind does not cling to emptiness, and in a future age one will attain anuttarā-samyak-saṃbodhi and achieve non-retrogression. This is called not forgetting the bodhicitta and correctly according with the Buddha path.”