Philosophy: a purple bullfinch in a lilac tree.
A good half of the effort of understanding what the Indian philosophers were after - and their subtleties make most of the great European philosophers look like schoolboys.
A philosophy can and must be worked out with the greatest rigour and discipline in the details, but can ultimately be founded on nothing but faith: and this is the reason, I suspect, why the novelties in philosophy are only in elaboration, and never in fundamentals.