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existed and worked. Next to this come certain treatises written in prose
and verse called the Upani@sads, which contain various sorts of
philosophical thoughts mostly monistic or singularistic but also some
pluralistic and dualistic ones. These are not reasoned statements, but
utterances of truths intuitively perceived or felt as unquestionably real
and indubitable, and carrying great force, vigour, and persuasiveness with
them. It is very probable that many of the earliest parts of this
literature are as old as 500 B.C. to 700 B.C. Buddhist philosophy began
with the Buddha from some time about 500 B.C. There is reason to believe
that Buddhist philosophy continued to develop in India in one or other of
its vigorous forms till some time about the tenth or eleventh century A.D.
The earliest beginnings of the other Indian systems of thought are also to
be sought chiefly between the age of the Buddha to about 200 B.C. Jaina
philosophy was probably prior to the Buddha. But except in its earlier
days, when it came in conflict with the doctrines of the Buddha, it
does not seem to me that the Jaina thought came much in contact with
other systems of Hindu thought. Excepting in some forms of Vai@s@nava
thought in later times, Jaina thought is seldom alluded to by the Hindu
writers or later Buddhists, though some Jains like Haribhadra and
Gu@naratna tried to refute the Hindu and Buddhist systems. The
non-aggressive nature of their religion and ideal may to a certain
extent explain it, but there may be other reasons too which it is
difficult for us to guess. It is interesting to note that, though there
have been some dissensions amongst the Jains about dogmas and creeds,
Jaina philosophy has not split into many schools of thought more or less
differing from one another as Buddhist thought did.

The first volume of this work will contain Buddhist and Jaina philosophy