佛說處處經 1.11

1.11

"That when the Buddha walks, high and low ground all becomes level is due to three nidānas: first, he originally practiced the four immeasurable minds, wishing to bring peace and security to all—the earth rests upon the waters, and in the waters there are spirits, and when worms, ants, and all creatures encounter the soles of the Buddha's feet, they all attain peace and security and establish their intentions with a single mind; therefore the low becomes high and the high becomes low; second, because the devas, ghosts, and spirits practice merit by clearing the ground for the Buddha, the high and low become level; third, because when the Buddha was a bodhisattva, he cleared thoroughfares, paths, and bridges to deliver people across; having attained merit from this, high and low are made straight and level, and he wishes people's minds to be likewise.