True faith is not assurance, but the readiness to go forward experimentally, without assurance. It is a sensitivity to things not yet known. Quakerism should not claim to be a religion of certainty, but a religion of uncertainty; it is this which gives us our special affinity to the world of science. For what we apprehend of truth is limited and partial, and experience may set it all in a new light; if we too easily satisfy our urge for security by claiming that we have found certainty, we shall no longer be sensitive to new experiences of truth. For who seeks that which he believes that he has found? Who explores a territory which he claims already to know?

Charles F Carter, 1971