[304] Furthermore, bhikkhus, 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 (sukha) 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, bhikkhus, there might be a lake whose waters well up from within, having no inlet for water from the eastern direction, no inlet for water from the western direction, no inlet for water from the northern direction, no inlet for water from the southern direction, and the sky would not from time to time bestow proper showers upon it;* then 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 cool water — even so, bhikkhus, 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. As he dwells thus diligent … Thus too, bhikkhus, a bhikkhu develops mindfulness directed to the body (kāyagatā sati).
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.