In the Brihadaranyaka Upanishad, there is a conversation between the great sage Yajnavalkya and his wife Maitreyi in which he said to her: “The Self, my dear Maitreyi, should verily be realized. How? “It should be heard of, reflected on and meditated upon. By the realization of the Self alone, my dear, through hearing, reflection, and meditation, all this is known.”
A symbol represents or recalls a thing by possession of analogous qualities or by association in fact or thought. The original Greek word symbolon means a sign by which one knows or infers a thing. Symbols express the invisible by means of visible or sensory representations—the immaterial via the material.