The answer was given in many ways by the Greek and Roman philosophers, by Confucius in China, by Christ in Judea, by Buddha and the great systems of Indian philosophy in Hindustan; and yet the question is still being asked with the old intensity, the old keen desire for answer!
Now, since these thousand years have, in India, left behind them a very remarkable literature which, even in these latter days, is the root of all life and thought in that vast peninsula, it is as well to attempt a slight sketch of the time, as a whole, before embarking on actual history; though to do the latter we shall, after treating of the religious age, have to hark back to the year 620 B.C.
At the commencement, then, of this thousand years, the Aryans were still pushing their way westwards and southwards from the alluvial plains of Northern India.
It seems likely that the tide of their conquest followed that of the retreating sea. However that may be, certain it is that they found before them dark, almost impenetrable, swampy forests, swarming with enemies of all kinds. Who or what these were we have at first small record. Doubtless the human foes belonged to the aboriginal tribes which are still to be found clinging to the far mountain uplands and inaccessible fastnesses which the Aryans did not care to annex. But in the literature of which mention has been made, all and sundry are disdainfully dismissed with the epithet "Rakshas," or evil demons.
Behind this shrinking verge of devildom, however, we know that "the children of light" were settling down; towns were springing up, waste land was being cleared and cultivated, schools were being established, and many principalities rising into power. But of all this we have as yet no record at all, until about one-half of the millennium was over. On the other hand, we have exhaustive literary evidence of what the minds of men were busying themselves about, first in the Ûpanishads, and then in the myriad Sûtras or Aphorisms, on every subject, apparently, under the sun, which are still extant.
Regarding the former--of which the German philosopher, Schopenhauer, wrote: "They have been the solace of my life; they will be the solace of my death"--though some of these treatises or essays belong, undoubtedly, to the dying years of the Epic age, they fall far more naturally into place during the opening years of this, the succeeding one. Their bold hypotheses covering all things were the first reaction against the soul-stifling formalisms of the Brahmânas; these, again, being due to the development of the dignity of the priestly class, which followed naturally on the excessive militarism so noticeable in the Mâhâbhârata. Of a truth, its stalwart warriors, for ever engaged in deadly combat and stirring adventures, could as heads of households have had little time for the due performance of domestic ceremonials after the customs of their fathers. Hence the rapid growth of the professional priesthood.
The fatal facility, however, with which speculative thought, after throwing off the shackles of canon and dogma, finds fresh slavery for itself in scientific formalism, is shown by the succeeding Sûtra literature, in which every department of thought and action is crystallised and codified into cut-and-dried form.
A reaction from this, again, is to be found in the succeeding philosophy of Kapîla and his disciples, which must have been promulgated a century or so before the birth of Gâutama Buddha. Frankly agnostic, many of the conclusions of this Sankhya system are to be found in the works of the latest German philosophers. Like theirs it is cold, and appeals not to the masses, but to speculative scholars. Still, it is strange that the very first recorded system of philosophy in the world, the very first attempt to solve the Great Question by the light of reason alone, should differ scarcely at all from the last. The human brain fails now, as it failed then; for Kapîla's doctrine never really overset those of the Ûpanishads, though the system of philosophy founded upon these last (and therefore called the Vedanta) was not to come for many years. But what, indeed, can or could overset the doctrine laid down in these same Ûpanishads, of a Universal Soul, a Universal Self, which is--to use the very words of the text:--
"Myself within the heart smaller than a corn of rice, smaller than a mustard seed, smaller than the kernel of a canary seed: myself within the heart greater than the earth, greater than the sky, greater than heaven. Lo! He who beholds all beings in this Self, and Self in all beings, he never turns away from it. When to a man who understands, the Self has become all things, what sorrow, what trouble can there be to him who has once beheld that unity? He, the Self, encircles all, bright, incorporeal, scatheless, pure, untouched by evil; a seer, wise, omnipresent, self-existent, he disposed all things rightly for eternal years. He therefore who knows this, after having become quiet, subdued, satisfied, patient and collected, sees Self in Self, sees all in Self. Evil does not overcome him, he overcomes all evil. Free from evil, free from stain, free from doubt, he becomes True Brahman. The wise who, meditating on this Self, recognises the Ancient who dwells for ever in the abyss, as God--he indeed leaves joy and sorrow far behind; having reached the subtle Being, he rejoices because he has obtained the cause of rejoicing."
Such words as these live for ever, a veritable Light in the Darkness of many philosophies.