Faith and Doubt in Science

“Doubt is an unavoidable part of belief. In the words of Paul Tillich, ‘Doubt isn’t the opposite of faith; it is an element of faith.’ If the case in favor of belief in God were utterly airtight, then the world would be full of confident practitioners of a single faith.’ But imagine such a world, where to opportunity to make a free choice about belief was taken away by the certainty of the evidence.” (pp. 33-34)