This book contains a number of essays on various fundamental topics of philosophy in the area of epistemology and metaphysics. Topics like doubt, memory, perception, truth and validity, the self, consciousness and universals are explored from the perspective of Indian philosophy. The discussion here is based on Indian philosophical texts which bear the evidence of analytical mind of the Indian thinkers and their critical approach to the subject. The author has suggested some new interpretation in some cases and offered some alternative solution to certain problems. These essays are the results of the author's intensive study of the subject. This book will be useful for students and researchers.