became more difficult at the end of the classical period of Indian philosophy, when logical and epistemological questions moved to the forefront of interest and when every system was compelled to take into consideration, on which their systems were founded […] Partly one tried to hold fast to the old line, as, for instance, when one explained: “The aphorisms of Bṛhaspati have only this aim, viz. to refute the opponent”. But in the majority of cases one decided to discuss the doctrine of inference and to take it over at least in parts. This desertion of the original attitude led, in no way, to the consequence of the decline of the system. The taking up of foreign thoughts and occupation with them led, on the contrary, to a regular activity and to a blossoming up of a literature richer than hitherto.