It was in protest against these evils that Gautama and many able philosophers arose about 500 B.C. Already the intellectual classes had matched the Brahmans by drawing upon Vedic authority for their philosophy. As the Brahmans had produced a ritual from the Vedas, so the philosophers framed a sort of philosophic Veda in the Upanishads. Men had begun to ask themselves the great questions of human life and destiny, "Whence am I? What is this mysterious being of which I am conscious?" They had begun to reason about nature, the origin of matter, the relation of mortals to the Infinite. The school of the Upanishads regarded themselves as an aristocracy of intellect, and held philosophy as their esoteric and peculiar prerogative. It was maintained that two distinct kinds of revelation had been made to men. First, that simple kind which was designed for priests and the common masses, for all those who regarded only effects and were satisfied with sacerdotal assumption and merit-making. But, secondly, there was a higher knowledge which concerned itself with the origin of the world and the hidden causes of things. Even to this day the Upanishads are the Vedas of the thinking classes of India.[43]

As the Brahmanas gave first expression to the doctrine of caste, so in the Upanishads we find the first development of pantheism and the doctrine of transmigration. The conclusion had already been reached that "There is only one Being who exists: He is within this universe and yet outside this universe: whoe'er beholds all living creatures as in Him, and Him the universal spirit, as in all, thenceforth regards no creature with contempt."

The language of Hindu speculation exhausts its resources in similes by which to represent personal annihilation. Man's origin and relations are accounted for very tersely by such illustrations as these: "As the web issues from the spider, as little sparks proceed from fire, so from the One Soul proceed all breathing animals, all worlds, all the gods, all beings." Then as to destiny: "These rivers proceed from the east toward the west, thence from the ocean they rise in the form of vapor, and dropping again, they flow toward the south and merge into the ocean. And as the flowing rivers are merged into the sea, losing their names and forms, so the wise, freed from name and form, pass into the Divine spirit, which is greater than the great."[44] Another favorite illustration is that of the moon's reflection in the water-jar, which disappears the moment the moon itself is hidden. "If the image in the water has no existence separate from that of the moon," says the Hindu, "how can it be shown that the human soul exists apart from God?"

The Mundaka Upanishad, based upon the Atharva Veda (one of the latest,—the Upanishad being later still), contains this account of the universe: "As the spider spins and gathers back (its thread); as plants sprout on the earth; as hairs grow on a living person; so is this universe here produced from the imperishable nature. By contemplation the vast one germinates; from him food (or body) is produced; and thence successively, breath, mind, real (elements) worlds, and immortality resulting from (good) deeds.

"The Omniscient is profound contemplation consisting in the knowledge of him who knows all; and from that, the (manifested) vast one, as well as names, forms, and food proceed; and this is truth."[45]

It is a great blemish upon the Upanishads, that while there are subtle, and in some respects sublime, utterances to be found here and there, the great mass is fanciful and often puerile, and in many instances too low and prurient to bear translation into the English language. This is clearly alleged by Mr. Bose, and frankly admitted by Max Müller.[46]

In the common protest which finally broke down the system of Brahmanical sacrifice, and for a time relaxed the rigors of caste tyranny, Buddhism then just appearing (say 500 B.C.), joined hand in hand with the philosophies. Men were tired of priestcraft, and by a natural reaction they went to an opposite extreme; they were tired of religion itself. Buddha became an undoubted atheist or agnostic, and six distinct schools of philosophy arose on the basis of the Upanishads—some of which were purely rationalistic, some were conservative, others radical. Some resembled the Greek "Atomists" in their theory,[47] and others fought for the authority, and even the supreme divinity, of the Vedas.[48] All believed in the eternity of matter, and the past eternity of the soul; all accepted the doctrine of transmigration, and maintained that the spiritual nature can only act through a material body. All were pessimistic, and looked for relief only in absorption.

But the progress of Hindu thought was marked by checks and counter-checks. As the tyranny of the priesthood had led to the protest of philosophy, so the extreme and conflicting speculations of philosophic rationalism probably gave rise to the conservatism of the Code of Manu. No adequate idea of the drift of Hindu thought can be gained without assigning due influence to this all-important body of laws. They accomplished more in holding fast the power of the Brahmans, and enabling them to stem the tide of intellectual rebellion, and finally to regain the sceptre from the hand of Buddhism, than all other literatures combined. Their date cannot be definitely known. They were composed by different men and at different times. They probably followed the Upanishads, but antedated the full development of the philosophic schools.

Many of the principles of Manu's Code had probably been uttered as early as the seventh century B.C.[49] The ferment of rationalistic thought was even then active, and demanded restraint. The one phrase which expresses the whole spirit of the laws of Manu is intense conservatism. They stand for the definite authority of dogma; they re-assert in strong terms the authority of the Vedas; they establish and fortify by all possible influences, the institution of caste. They enclose as in an iron framework, all domestic, social, civil, and religious institutions. They embrace not only the destiny of men upon the earth, but also the rewards and punishments of the future life. Whatever they touched was petrified. Abuses which had crept in through the natural development of human depravity—for example, the oppression of woman—the laws of Manu stamped with inflexible and irreversible authority. The evils which grow up in savage tribes are bad enough, the tyranny of mere brute force is to be deplored, but worst of all is that which is sanctioned by statute, and made the very corner-stone of a great civilization. Probably no other system of laws ever did so much to rivet the chains of domestic tyranny.[50]

The Code of Manu has been classified as, 1st, sacred knowledge and religion; 2d, philosophy; 3d, social rules and caste organization; 4th, criminal and civil laws; 5th, systems of penance; 6th, eschatology, or the doctrine of future rewards. No uninspired or non-Vedic production has equal authority in India. We can only judge of its date by its relative place among other books. It applies Vedic names to the gods, though it mentions Brahma and Vishnu, but it makes no reference to the Trimurti. Pantheism was evidently in existence and was made prominent in the code. The influence of Manu over the jurisprudence of India was a matter of growth. At first the code appears to have been a guide in customs and observances, but as it gained currency it acquired the force of law, and extended its sway over all the tribes of India. It was not, however, maintained as a uniform code throughout the land, but its principles were found underlying the laws of all the provinces. Its very merits were finally fruitful of evil. Human weal was sacrificed to the over-shadowing power of a system of customs cunningly wrought and established by Brahmanical influence. The author was evidently a Brahman, and the whole work was prepared and promulgated in the interests of Brahmanism as against all freedom of thought. Its support of the Vedas was fanatical. Thus: "A Brahman by retaining the Rig Veda in his memory incurs no guilt, though he should destroy the three worlds." Again: "When there is contradiction of two precepts in the Veda, both are declared to be law; both have been justly promulgated by known sages as valid law."