An Introduction to Natural Theology

"What is the God of the philosopher? Can the philosopher, that is to say, can human reason, unenlightened by the revealed word, come to a true and secure understanding of 'He-Who-Is'? Is it possible for mere man, without the impact of a personal experience, intimate and intuitive, to arrive by means of an objective demonstration at an absolute affirmation that the Being we call God exists, or that He is Pure Act, Existence Itself, because without him the world of our experience is unintelligible