[344] Furthermore, Udāyi, with the subsiding of thought and examination (vitakka-vicāra) … a bhikkhu enters and dwells in the second jhāna. He drenches, steeps, fills, and pervades this very body with the rapture (pīti) and pleasure born of concentration (samādhi), so that there is no part of his whole body that is unpervaded by the rapture and pleasure born of concentration. Just as, Udāyi, there might be a deep lake whose water wells up from a spring: it would have no inflow of water from the eastern direction, no inflow of water from the western direction, no inflow of water from the northern direction, no inflow of water from the southern direction, nor would the sky-deva from time to time pour down proper showers upon it; yet the cool current of water welling up from within that lake would drench, steep, fill, and pervade that very lake with cool water, so that there would be no part of the whole lake unpervaded by the cool water — even so, Udāyi, a bhikkhu drenches, steeps, fills, and pervades this very body with the rapture and pleasure born of concentration, so that there is no part of his whole body that is unpervaded by the rapture and pleasure born of concentration.
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.