To deny God means to deny yourself as a spiritual, rational being.
I know God and the soul not by way of definition, but by a completely different way. Definition destroys this knowledge in me. I know for certain that God exists and that my soul exists. But this knowledge is certain to me only because I am inexorably led to it. To the certainty of knowing God I am led by the question: where do I come from? To the knowledge of the soul I am led by the question: what am I?
Where do I come from?
I am born from my mother, and she from my grandmother, and she from my great-grandmother, but who was the very last one born from? And so I inevitably come to God.
Who am I?
I am not my legs, I am not my hands, I am not my head, I am not my feelings, I am not even my thoughts. So what am I?
I am I—my soul.
From whichever direction I come to God, it is the same thing: God is the source of my thought, my reason; he is also the source of my love; he is also the source of materiality.
It is the same with the concept of the soul. If I turn to my pursuit of truth, I know that the pursuit of truth is my immaterial foundation—my soul; if I turn to my feeling of love for goodness, I again find the reason for this love in my soul.
Whether or not he wants to, even the most unbelieving person recognizes God. He cannot not recognize that his life is governed by a law—a law which he can obey or try to evade. And it is this recognition of the highest law, of which he knows but which is inaccessible to him, is what God is, or at least a manifestation of him.
God manifests in the best thoughts, in the truthfulness of speech, in the sincerity of deed, and with his spirit he gives prosperity and eternity to the world.
— The Avesta
God exists. We are not required to and do not have to prove it. Every attempt to prove his existence is already a blasphemy; every denial of him is insanity. God lives in our conscience, in the consciousness of humankind, in the universe around us. Our consciousness and our conscience appeal to him in the most solemn minutes of sorrow and joy. Only the most pathetic or the most criminal person can deny God under the starry vault of the night sky, at a coffin of a dear friend or at the execution of a martyr.
— Mazzini
The life of the world happens according to someone’s will—someone is doing something of his own with the life of the universe and with our lives. The one that is doing this is that which we call God.
People do not believe in God only when they believe the lies that are presented as God.