摩訶止觀 2.19

2.19

Regarding mental discussion of calming and contemplation: contemplate Amitābha Buddha of the western direction, a hundred thousand koṭis of buddha-lands away from here, sitting and preaching the sūtra amidst jeweled ground, jeweled ponds, jeweled trees, jeweled halls, and a host of bodhisattvas. For three months, constantly contemplate the Buddha. How to contemplate? Contemplate the thirty-two marks: from the thousand-spoked wheel mark on the soles of the feet, reverse-trace and contemplate each mark up to the invisible cranial protuberance; one should also trace forward from the cranial protuberance down to the thousand-spoked wheels, wishing: "May I also attain these marks."