佛說觀佛三昧海經 1.37

1.37

The Buddha addressed his father, the king: "If there are sentient beings who wish to be mindful of the Buddha, wish to contemplate the Buddha, wish to see the Buddha, wish to discern the primary and secondary marks, wish to perceive the Buddha's light, wish to know the interior of the Buddha's body, wish to learn to contemplate the Buddha's mind, wish to learn to contemplate the Buddha's crown, wish to learn to contemplate the thousand-spoked wheel marks beneath the Buddha's feet, wish to know the marks at the time of the Buddha's birth, wish to know the time the Buddha took a consort, wish to know the time of the Buddha's renunciation, wish to know the time of the Buddha's austerities, wish to know the time of the Buddha's subduing of Māra, wish to know the time the Buddha attained anuttarā samyaksaṃbodhi, wish to know the marks when the Tathāgata turned the wheel of Dharma, wish to know the mark of the Tathāgata's precious horse-sheath organ, wish to know the marks when the Tathāgata ascended to the Trāyastriṃśa Heaven to preach the Dharma for his mother, Lady Māyā, wish to know the marks when the Tathāgata descended from the Trāyastriṃśa Heaven, wish to know the marks of light in the Tathāgata's four postures of walking, standing, sitting, and lying down, wish to know the marks when the Tathāgata went to Kuśinagara to tame and deliver the Mallas, or wish to know the marks of the light from his pores when the Tathāgata subdued the wilderness spirits."