In Rig Veda, we read, “ekam sad viprāḥ bahudhā vadanti” this means that which exists is One; sages call it by various names. If this is true that there is only one reality then why do we criticize others saying, I am the best and others are not. In some sense we are subjective and we are trying to project our transcendental self through different ways and means for example, through philosophy, theology and religion. The main reason behind this is nothing but ego and because of that ego we like certain things and deny certain things. There are similar problems in philosophy too, one considers himself as the best and puts down the other. Even when we accept God as an article of faith, the concept varies with different religions and traditions. How God is conceived in one tradition is different from the other and therefore it should be studied comparatively. The present book attempts to probe into such basic questions of God in the light of the historical and philosophical development of this concept and the contemporary reaction to the question of God concerning to two prominent traditions, namely, Nyāya and Christian, with special reference to Udayana and Thomas Aquinas. About the Author Rajen Lakra holds a PhD in Philosophy and Religion from Banaras Hindu University, Varanasi. Besides, he holds a degree of BTh from St. Charles Seminary, affiliated to St. Thomas Aquinas University (PUST), Angelicum, Rome. At present he is the dean of philosophy at St. Charles Seminary, Nagpur, and he also teaches philosophy at Gyanadhara; Dominican Institute of Philosophy, Goa. Besides he is a course contributor in the faculty of Philosophy in Domuni Universitas (Online Course) and a guest professor at Hislop College, Nagpur. He has authored two books Glimpses of Nyāya-Vaiśeṣika and Fulfillment of the Law in Jesus: with Special Reference to John 1:17.