Paul Tillich on Doubt as an Element of FaithPaul Tillich, Systematic Theology, Volume 2 (University of Chicago Press: Feb. 15, 1975), pp 116-7.
The affirmation that Jesus is the Christ is an act of faith and consequently of daring courage. It is not an arbitrary leap into darkness but a decision in which elements of immediate participation and therefore certitude are mixed with elements of strangeness and therefore incertitude and doubt. But doubt is not the opposite of faith; it is an element of faith. Therefore, there is no faith without risk . The risk of faith is that it could affirm a wrong symbol of ultimate concern, a symbol which does not really express ultimacy (as, e.g., Dionysus or one’s nation). But this risk lies in quite a different dimension from the risk of accepting uncertain historical facts. It is wrong, therefore, to consider the risk concerning uncertain historical facts as part of the risk of faith. The risk of faith is existential; it concerns the totaliy of our being, while the risk of historical judgments is theoretical and open to permanent scientific correction. Here are two different dimensions which should never be confused. A wrong faith can destroy the meaning of one’s life; a wrong historical judgment cannot. It is misleading, therefore, to use the word “risk” for both dimensions in the same sense.