The word ‘Veda’ comes from the root ‘Vid – to know, leading to ‘Vidya’, knowledge which leads further to vision, meaning revelation, self-realization. The Veda is the book of knowledge of Changeless Reality. The four Vedas form a body of religious literature called Shruti. ‘Shruti’ means ‘heard’, experienced and ‘spiritually revealed’. The realized souls, the Rishis, responded to the divine vibrators around them and in their minds and hearts felt and experienced ecstasy. This ecstasy they expressed in the form of Hymns of praise to glory of nature and later prayers to the gods controlling nature.