These three planes, collectively known as Trilokî, are the planes of personality. Kâma is the guiding principle of existence in Trilokî, and a recurrence of births and re-births its main characteristic. With every Night of Brahmâ, this triple plane comes to an end, transferring its energies to the next higher plane, and is re-born with every Day of Brahmâ. Mahar is intermediate between Trilokî and the three higher Lokas of Universality. The Vedic school laid great stress on communion with the Devas of Svar Loka or Svarga or Indra Loka, and this was pre-eminently known as Vedic Yajna. The performance of Vedic Yajna led only to a prolonged gratification of kâma in Svar Loka. But however long the period might be, it was limited by the magnitude of the force (Apûrva) which buoyed up the individuality in the Svar Loka. As the Gitâ says, when the merits are exhausted the observer of Vedic Dharma enters again into the transitory plane. The course of births and re-births is then set up anew, with constant transformations and with all the miseries of existence conditioned by personality. This was not Mukti or liberation. The followers of the post-vedic or Upanishad school contended that liberation lay in crossing the triple plane of individuality to the higher cosmic planes of universality. When an individual reaches the higher planes, he does not again become subject to transformations, and to the constant recurrence of births and re-births. There is one continued life, one continued existence in the higher planes, till the end of cosmos or the Life of Brahmâ. This life is not measured by personalities but is the cosmical life, and the individuality becomes a cosmical entity. Further there is life also beyond the cosmos, in the highest plane, the abode of the Supreme. The Gitâ only incidentally describes the highest plane in the following sloka: "That is my supreme abode, by reaching which (Jivas) do not recur (to fresh births). Not the Sun, not the Moon, not even fire illumines that." — XV. 6. Krishna also refers to that plane in VIII. 20 and XV. 4. 5.