佛說觀佛三昧海經 3.6

3.6

“After the Buddha’s nirvāṇa, if the Buddha’s disciples focus their mindfulness, contemplate, and perform this visualization, they will eliminate the sins of a hundred kalpas of birth and death, and will see all Buddhas face-to-face, clearly and without doubt. Contemplating in this way is called correct contemplation; contemplating otherwise is called incorrect contemplation.”