Pharyngula

Temples and churches, pagodas and mosques, in all lands and in all ages, in splendour and vastness, testify to the metaphysical need of man, which, strong and ineradicable, follows close upon his physical need. Certainly whoever is satirically inclined might add that this metaphysical need is a modest fellow who is content with poor fare. It sometimes allows itself to be satisfied with clumsy fables and insipid tales. If only imprinted early enough, they are for a man adequate explanations of his existence and supports of his morality. Consider, for example, the Koran. This wretched book was sufficient to found a religion of the world, to satisfy the metaphysical need of innumerable millions of men for twelve hundred years, to become the foundation of their morality, and of no small contempt for death, and also to inspire them to bloody wars and most extended conquests. We find in it the saddest and the poorest form of Theism. Much may be lost through translation; but I have not been able to discover one single valuable thought in it. Such things show that metaphysical capacity does not go hand in hand with the metaphysical need. Yet it will appear that in the early ages of the present surface of the earth this was not the case, and that those who stood considerably nearer than we do to the beginning of the human race and the source of organic nature, had also both greater energy of the intuitive faculty of knowledge, and a truer disposition of mind, so that they were capable of a purer, more direct comprehension of the inner being of nature, and were thus in a position to satify the metaphysical need in a more worthy manner. Thus originated in the primitive ancestors of the Brahmans, the Rishis, the almost superhuman conceptions which were afterwards set down in the Upanishads of the Vedas.

[Schopenhauer, "World as Will and Idea"]