“Evidently, self-consciousness is in relation to the individual himself and therefore has to be experienced in his being, with a centre in the body as the centre of experience. It resembles the dynamo of a machine, which gives rise to all sorts of electrical works.

“Not only [does] it [maintain] the life of the body and the activities of all its parts and organs, conscious and unconscious, but also the relation between the physical and the subtler planes, on which the individual functions.

“Also, like the dynamo, it vibrates and can be felt by the calm mind that pays attention to it. It is known to the yogis and sadhakas by the name of sphurana, which in samadhi scintillates with consciousness.” – Ramana Maharishi

(S.S. Cohen, Guru Ramana. Memories and Notes. 6th edition. Tiruvannamalai: Sri Ramanasramam, 1993, 82.)