Karl Potter (Presuppositions of Indian Philosophies, see here) relates all Indian philosophical systems to the fact that they are goal-oriented and all seek mokṣa ‘liberation’. Jonardon Ganeri (in his History of Philosophy in India, with Peter Adamson) introduces the subject in a similar way (see here), speaking of the fact of seeking the “highest good”. As often the case, Daya Krishna disagrees:
The deliberate ignoring of [the] […] twentieth century discussion […] is only a symptom of that widespread attitude which does not want to see Indian philosophy as a rationcinative enterprise seriously engaged in argument and counter-argument in its long history and developing […]. This, and not mokṣa, is its life-breath as it is sustained and developed by it. Those, and this includes almost everybody, who think otherwise believe also that Indian philosophy stopped growing long ago. (The Nyāya Sūtras: A new commentary on an old text, p. 8)
What do you think? Is there a common core to all Indian philosophical schools?