"The scientist is possessed by the sense of universal causation. ... His religious feeling takes the form of rapturous amazement at the harmony of natural law, which reveals an intelligence of such superiority that, compared with it, all the systematic thinking and acting of human beings is an utterly insignificant reflection. This feeling is the guiding principle of his life and work, in so far as he succeeds in keeping himself from the shackles of selfish desire." (from: The World As I See It)
"I cannot conceive of a personal God who would directly influence the actions of individuals, or would directly sit in judgement on creatures of his own creation. I cannot do this in spite of the fact that mechanistic causality has, to a certain extent, been placed in doubt by modern science. (He was speaking of Quantum Mechanics and the breaking down of determinism.) My religiousity consists in a humble admiration of the infinitely superior spirit that reveals itself in the little that we, with our weak and transitory understanding, can comprehend of reality. Morality is of the highest importance -- but for us, not for God." (from: The Human Side)
"The most beautiful and most profound emotion we can experience is the sensation of the mystical. It is the sower of all true science. He to whom this emotion is a stranger, who can no longer wonder and stand rapt in awe, is as good as dead. To know what is impenetrable to us really exists, manifesting itself as the highest wisdom and the most radiant beauty which our dull faculties can comprehend only in the most primitive form this knowledge, this feeling is at the center of true religiousness. The cosmic religious experience is the strongest and oldest mainspring of scientific research. My religion consists of a humble admiration of the illimitable superior spirit who reveals himself in the slight details we are able to perceive with our frail and feeble minds. That deeply emotional conviction of the presence of a superior reasoning power, which is revealed in the incomprehensible universe, forms my idea of God."
(quotation from Albert Einstein (1875-1955), as translated by Alan Harris)