But What if It's True? - The Uncertainty of Doubt

"Anyone who makes up his mind to evade the uncertainty of belief will have to experience the uncertainty of unbelief, which can never finally eliminate for certain the possibility that belief may after all be the truth. It is not until belief is rejected that its unrejectability becomes evident. It may be appropriate at this point to cite a Jewish story told by Martin Buber; it presents in concrete form the above-mentioned dilemma of being a man.
An adherent of the Enlightenment [writes Buber], a very learned man, who had heard of the Rabbi of Berditchev, paid a visit to him in order to argue, as was his custom, with him, too, and to shatter his old-fashioned proofs of the truth of his faith. When he entered the Rabbi's room, he found him walking up and down with a book in his hand, rapt in thought. The Rabbi paid no attention to the new arrival. Suddenly he stopped, looked at him fleetingly, and said, 'But perhaps it is true after all.' The scholar tried in vain to collect himself—his knees trembled, so terrible was the Rabbi to behold and so terrible his simple utterance to hear. But Rabbi Levi Yitschak now turned to face him and spoke quite calmly: 'My son, the great scholars of the Torah with whom you have argued wasted their words on you; as you departed you laughed at them. They were unable to lay God and his Kingdom on the table before you, and neither can I. But think, my son, perhaps it is true.' The exponent of the Enlightenment opposed him with all his strength; but this terrible 'perhaps' that echoed back at him time after time broke his resistance.
Here we have, I believe—in however strange a guise—a very price description of the situation of man confronted with the question of God."