At Sāvatthī. “Mendicants, before my awakening—when I was still unawakened but intent on awakening—I thought: ‘What’s the cause, what’s the reason for the development of the bases of psychic power?’ Then it occurred to me: ‘It’s when a mendicant develops the basis of psychic power that has immersion due to enthusiasm, and active effort. They think: “My enthusiasm won’t be too lax or too tense. And it’ll be neither constricted internally nor scattered externally.” And they meditate perceiving before and behind: as before, so behind; as behind, so before; as below, so above; as above, so below; as by day, so by night; as by night, so by day. And so, with an open and unenveloped heart, they develop a mind that’s full of radiance.

They develop the basis of psychic power that has immersion due to energy …