Maimonides on Existence of God

“You are no doubt aware that the Almighty, desiring to lead us to perfection and to improve our state of society, has revealed to us laws which are to regulate our actions. These laws, however, presuppose an advanced state of intellectual culture. We must first form a conception of the Existence of the Creator according to our capabilities; that is, we must have a knowledge of Metaphysics. But this discipline can only be approached after the study of Physics: for the science of Physics borders on Metaphysics, and must even precede it in the course of our studies, as is clear to all who are familiar with these questions.”

“The being which has absolute existence, which has never been and will never be without existence, is not in need of an agent...The question, "What is the purpose thereof?" cannot be asked about anything which is not the product of an agent; therefore we cannot ask what is the purpose of the existence of God...For that which is without a beginning, a final cause need not be sought...This must be our belief when we have a correct knowledge of our own self, and comprehend the true nature of everything; we must be content, and not trouble our mind with seeking a certain final cause for things that have none, or have no other final cause but their own existence, which depends on the Will of God, or, if you prefer, on the Divine Wisdom...If the whole earth is infinitely small in comparison with the sphere of the stars, what is man compared with all these created beings? How, then, could any one of us imagine that these things exist for his sake and benefit, and that they are his tools! This is a result of an examination of the corporeal beings: how much more so will be the result of an examination of the Intelligences!”