There are two aspects of Nibbana.
May there be well-being! The reason why it is stated that there will be no eighth existence for a person who has attained the stage of sotapatti or the first stage of sanctity is that such a being can live at the most for only a period of seven existences in the realm of sense spheres.
Yaṃ kiñci vittaṃ idha vā huraṃ vā, saggesu vā yaṃ ratanaṃ paṇītaṃ; Na no samaṃ atthi tathāgatena, idampi buddhe ratanaṃ paṇītaṃ; Etena saccena suvatthi hotu.
The other two are of course the Mangala Sutta, the sutta of blessings or auspicious signs and the Karaniya Metta Sutta, the sutta on the development of loving kindness.
Tasmâhi bhûtâni sâmêtha sabbê - mettam karôtha mânusiya pajâya, Divâ ca rattô ca haranti yê balim - tasmâhi nê rakkhatha appamattâ.
Xin ban rải lòng từ ái đến tất cả các chúng sanh.