One Possible Basis for a Demonstration of the Existence of God, Paperback by Kant, Immanuel; Treash, Gordon (TRN), ISBN 0803277776, ISBN-13 9780803277779, Like New Used, Free shipping in the US

The search for God is dictated not from without but from a profound sense of one's own moral being and worthiness to be happy. The core of Immanuel Kant's argument remains relevant to the experience of ordinary men and women. He wished to strengthen, not undermine, belief in God and in the spiritual nature of humankind.
This 1763 essay is important in understanding the development of Kant's thought. It exposed the flaw in the Cartesian argument that the existence of a perfect being could be deduced from an idea or concept of such. Similarly, Kant saw the problem inherent in the Leibnizian view of a philosophical system modeled on mathematics: a philosopher who, like a mathematician, began with an arbitrary definition remained trapped in a circle of words. In The One Possible Basis for a Demonstration of the Existence of God, Kant diverged from the familiar forms of ontological argument. The result was a brilliant approach to divine being that anticipated his mature Critique of Pure Reason.