Brahman is that which is permanent in things that change. It is without name and form, which two are the characteristic natures of the world of appearance, and is essentially existence-absolute. Existence can never change, never perish, though things in which also it is, perish.
Rigveda has proclaimed: “The One Being the wise diversely speak of.” All philosophy proceeds from this, all religion is based on this. We, moreover, hear such declarations as “Truth, Knowledge, Infinity is Brahman,” “Consciousness, Bliss, is Brahman,” “All this is, verily, Brahman,” “This Self is Brahman,” “Immortal, Fearless, is Brahman,” and the like.