mental development …

inquiry, and active effort. They think: “My inquiry 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.’