an.3.158 Aṅguttara Nikāya (Numbered Discourses)

They develop the basis of psychic power that has immersion due to enthusiasm, and active effort.
They develop the basis of psychic power that has immersion due to energy, and active effort.
They develop the basis of psychic power that has immersion due to mental development, and active effort.
They develop the basis of psychic power that has immersion due to inquiry, and active effort. …