Knowledge, Theory of Philosophy 19 Metaphysics 17 Philosophy, Indic 10 Ethics 9 Methodology 9 Reason 9 Truth 7 Belief and doubt 6 Causation 5 Epistemology 5 Experience 5 Language and languages 5 Philosophy, Modern 5 Science 5 Analysis (Philosophy) 4 History 4 Meaning (Philosophy) 4 Nyaya 4 Phenomenology 4 Philosophy, French 4 Realism 4 Act (Philosophy) 3 Aesthetics 3 Congresses 3 Descartes, Rene-Philosophy 3 First philosophy 3 Idealism 3 Knowledge, Sociology of 3 Logic 3