In studying all religions you will notice the fact that whatever is old becomes holy. For instance, our forefathers in India used to write on birch bark, but in time they learnt how to make paper. Yet the birch bark is still looked upon as very holy. When the utensils in which they used to cook in ancient times were improved upon, the old ones became holy; and nowhere is this idea more kept up than in India. Old methods, which must be nine or ten thousand years old, as of rubbing two sticks together to make fire, are still followed. At the time of sacrifice no other method will do. So with the other branch of the Asiatic Aryans. Their modern descendants still like to obtain fire from lightning, showing that they used to get fire in this way. Even when they learnt other customs, they kept up the old ones, which then became holy. So with the Hebrews. They used to write on parchment. They now write on paper, but parchment is very holy. So with all nations. Every rite which you now consider holy was simply an old custom, and the Vedic sacrifice were of this nature. In course of time, as they found better methods of life, their ideas were much improved; still these old forms remained, and from time to time they were practiced and received a holy significance.