[326] Furthermore, student, with the subsiding of applied thought and sustained examination (vitakka-vicāra), a bhikkhu enters and dwells in the second jhāna, which possesses internal serene confidence (sampasādana) and unification of mind (ekodibhāva), is without applied thought and without sustained examination, and has rapture (pīti) and happiness (sukha) born of concentration (samādhi). He drenches, steeps, fills, and pervades this very body with the rapture and happiness born of concentration, so that there is no part of his whole body that is unpervaded by the rapture and happiness born of concentration. Just as, student, there might be a deep lake whose waters well up from a spring, having no inlet for water from the eastern direction, no inlet for water from the southern direction, none from the western direction, and no inlet for water from the northern direction — and though the sky might from time to time bestow a proper shower, yet the cool streams of water, welling up from 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, student, a bhikkhu … Insofar, student, as a bhikkhu, with the subsiding of applied thought and sustained examination … enters and dwells in the second jhāna, and drenches, steeps, fills, and pervades this very body with the rapture and happiness born of concentration, so that there is no part of his whole body that is unpervaded by the rapture and happiness born of concentration — this too pertains to his concentration.
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.