Avicenna believes that God must be understood in the first place as the Necessary Existent (wâǧib al-wuǧûd). In his various works, he provides different versions of an ingenious argument for the existence of the Necessary Existent—the so-called Proof of the Sincere (burhân al-ṣiddîqîn)—and argues that all the properties that are usually attributed to God can be extracted merely from God's having necessary existence. Considering the centrality of tawḥîd to Islam, the first thing Avicenna tries to extract from God's necessary existence is God's oneness. The aim of the present Element is to provide a detailed discussion of Avicenna's arguments for the existence and unity of God. Through this project, the author hopes to clarify how, for Avicenna, the Islamic concept of monotheism is intertwined with the concept of essential existence.

The most comprehensive account of the full range of Leibniz's thought.

Yujin Nagasawa presents a new, stronger version of perfect being theism, the conception of God as the greatest possible being. Although perfect being theism is the most common form of monotheism in the Judeo-Christian-Islamic tradition its truth has been disputed by philosophers and theologians for centuries. Nagasawa proposes a new, game-changing defence of perfect being theism by developing what he calls the 'maximal concept of God'. Perfect being theists typically maintain that God is an omniscient, omnipotent, and omnibenevolent being; according to Nagasawa, God should be understood rather as a being that has the maximal consistent set of knowledge, power, and benevolence. Nagasawa argues that once we accept the maximal concept we can establish perfect being theism on two grounds. First, we can refute nearly all existing arguments against perfect being theism simultaneously. Second, we can construct a novel, strengthened version of the modal ontological argument for perfect being theism. Nagasawa concludes that the maximal concept grants us a unified defence of perfect being theism that is highly effective and economical.

In many places and times, and for many people, God's existence has been rather less than a clear fact. According to the hiddenness argument, this is actually a reason to suppose that it is not a fact at all. The hiddenness argument is a new argument for atheism that has come to prominence in philosophy over the past two decades. J. L. Schellenberg first developed the argument in 1993, and this book offers a short and vigorous statement of its central claims and ideas. Logically sharp but so clear that anyone can understand, the book addresses little-discussed issues such as why it took so long for hiddenness reasoning to emerge in philosophy, and how the hiddenness problem is distinct from the problem of evil. It concludes with the fascinating thought that retiring the last of the personal gods might leave us nearer the beginning of religion than the end. Though an atheist, Schellenberg writes sensitively and with a nuanced insider's grasp of the religious life. Pertinent aspects of his experience as a believer and as a nonbeliever, and of his own engagement with hiddenness issues, are included. Set in this personal context, and against an authoritative background on relevant logical, conceptual, and historical matters, The Hiddenness Argument's careful but provocative reasoning makes crystal clear just what this new argument is and why it matters.

Comprising groundbreaking dialogues by many of the most prominent scholars in Christian apologetics and the philosophy of religion, this volume offers a definitive treatment of central questions of Christian faith. The essays are ecumenical and broadly Christian, in the spirit of C.S. Lewis's Mere Christianity, and feature lucid and up-to-date material designed to engage readers in contemporary theistic and Christian issues. Beginning with dialogues about God's existence and the coherence of theism and then moving beyond generic theism to address significant debates over such specifically Christian doctrines as the Trinity and the resurrection of Jesus, Debating Christian Theism provides an ideal starting point for anyone seeking to understand the current debates in Christian theology.

God and Necessity: A Defense of Classical Theism argues that the God of classical theism exists and could not fail to exist. The book begins with the definition of key terms and analysis of the concepts of God and necessity. Extended examinations of the ontological, cosmological, and teleological arguments are given. The last chapters give an extended exposition and defense of the transcendental argument for God's existence. It is shown that rival accounts of the existence of universe, the Brute Fact and the Necessary Universe theories completely fail, while Necessary Deity, the concept of God existing in all possible worlds, succeeds. Only the latter can account for reality as it is, and can account for knowledge and justification.

This extended essay presents the meditations of an eminent scholar on medieval philosophical theology. Beginning with a discussion of faith and reason, Ramon M. Lemos argues that we can be practically justified in accepting certain religions even though we may not know that their central claims are true. Lemos moves on to his operational definition of God, based on St. Anselm's concept of God as a being that which no greater can be conceived. From this ground, he considers various medieval arguments for the existence of God and refutes the ability of the major arguments to succeed in demonstrating God's existence. He concludes that it is impossible to demonstrate the existence of God philosophically. This provocative book addresses the fundamental issues in the philosophy of religion--from a Christian perspective--while maintaining the necessary intellectual distance between revealed theology and philosophy.