Cow-worship. The idea of any such “worship” is as erroneous as it is unjust. No Egyptian worshipped the cow, nor does any Hindu worship this animal now, though it is true that the cow and bull were sacred then as they are to-day, but only as the natural physical symbol of a metaphysical ideal; even as a church made of bricks and mortar is sacred to the civilized Christian because of its associations and not by reason of its walls. The cow was sacred to Isis, the Universal Mother, Nature, and to the Hathor, the female principle in Nature, the two goddesses being allied to both sun and moon, as the disk and the cow’s horns (crescent) prove. (See “Hathor ‘ and “isis”.) In the Vedas, the Dawn of Creation is represented by a cow. This dawn is Hathor, and the day which follows, or Nature already formed, is Isis, for both are one except in the matter of time. Hathor the elder is “the mistress of the seven mystical cows ” and Isis, “the Divine Mother is the “cow-horned” the cow of plenty (or Nature, Earth), and, as the mother of Horus (the physical world)—the “mother of all that lives The outa was the symbolic eye of Horus, the right being the sun, and the left the moon. The right “eye” of Horus was called “the cow of Hathor”, and served as a powerful amulet, as the dove in a nest of rays or glory, with or without the cross, is a talisman with Christians, Latins and Greeks. The Bull and the Lion which we often find in company with Luke and Mark in the frontispiece of their respective Gospels in the Greek and Latin texts, are explained as symbols—-which is indeed the fact. Why not admit the same in the case of the Egyptian sacred Bulls, Cows, Rams, and Birds?
Source: H.P.Blavatsky - The Theosophical Glossary