Despite his intense biblical study and belief in a creating God, Newton observed the distinction between religion and science made by Galileo: “The Bible tells us how to go to Heaven, not how the heavens go.” During his presidency of the Royal Society, Newton banned any subject touching religion, even apologetics. He wrote, “We are not to introduce divine revelations into philosophy [science], nor philosophical [scientific] opinions into religion.”

Yet for Newton this distinction was not a divorce, much less a conflict. Although the books of God’s Word and his Works were not to provide the content of each other’s teachings, they were bound together. Newton did not consider one to be sacred and the other secular, nor did Copernicus, Kepler, Galileo, or Pascal—all practicing Christians. Only later Enlightenment philosophy produced a model of “warfare” between science and theology.

Newton’s theology profoundly influenced his scientific method, which rejected pure speculation in favor of observations and experiments.