The oldest surviving Vedic hymns, such as hymn1.115 of the Rigveda, mention "Surya" with particular reverence for the "rising sun" and its symbolism as dispeller of darkness, one who empowers knowledge, the good, and all life. However, the usage is context specific. In some hymns, the word Surya simply means sun as an inanimate object, a stone, or a gem in the sky (Rigvedic hymns 5.47, 6.51 and 7.63) while in others it refers to a personified deity. In the layers of Vedic texts, Surya is one of the several trinities along with Agni and either Vayu or Indra, which are presented as an equivalent icon and aspect of the Hindu metaphysical concept called the Brahman.