In the Vedas the word “brahma” signifies “devotion” or “the highest religious knowledge”. Later Brahmă (neuter) was applied to the World Soul, the All in All, the primary substance from which all that exists has issued forth, the Eternal Being “of which all are phases”; Brahmă was the Universal Self, the Self in the various Vedic gods, the Self in man, bird, beast, and fish, the Life of Life, the only reality, the unchangeable. This one essence or Self (Atman) permeates the whole Universe. Brahmă is the invisible force in the seed, as he is the “vital spark” in mobile creatures. In the _Khandogva Upanishad_ a young Brahman receives instruction from his father. The sage asks if his pupil has ever endeavoured to find out how he can hear what cannot be heard, how he can see what cannot be seen, and how he can know what cannot be known? He then asks for the fruit of the Nyagrodha tree. “Here is one, sir.” “Break it.” “It is broken, sir.” “What do you see there?” “Not anything, sir.” “My son,” said the father, “that subtile essence which you do not perceive there, of that very essence this great Nyagrodha tree exists. Believe it, my son. That which is the subtile essence, in it all that exists has itself. It is the True. It is the Self; and thou, my son, art it.” In _Katha Upanishad_ a sage declares: The whole universe trembles within the life (Brahmă); emanating from it (Brahmă) the universe moves on. It is a great fear, like an uplifted thunderbolt. Those who know it become immortal.... As one is reflected in a looking-glass, so the soul is in the body; as in a dream, so in the world of the forefathers; as in water, so in the world of the Gandharvas; as in a picture and in the sunshine, so in the world of Brahmă.... The soul's being (nature) is not placed in what is visible; none beholds it by the eye.... Through thinking it gets manifest Immortal become those who know it.... The soul is not to be gained by word, not by the mind, not by the eye, how could it be perceived by any other than him who declares it exists? When all the desires cease that are cherished in his heart (intellect) then the mortal becomes immortal. When all the bonds of the heart are broken in this life, then the mortal becomes immortal....[146] [146] Dr. E. Röer's translation (Calcutta). The salvation of the soul is secured by union with Brahmă, the supreme and eternal Atman (Self), “the power which receives back to itself again all worlds.... The identity of the Brahmă and the Atman, of God and the Soul, is the fundamental thought of the entire doctrine of the Upanishads.”[147] [147] Deussen's _Philosophy of the Upanishads_, p. 39. Various creation myths were framed by teachers to satisfy the desire for knowledge regarding the beginning of things. The divine incarnation of Brahmă is known as Brahma (masculine) Prajapati, and Nãrãyana.