He who bases or thinks that he bases his conduct--his inward or his outward conduct, his feeling or his action--upon a dogma or theoretical principle which he deems incontrovertible, runs the risk of becoming a fanatic, and moreover, the moment that this dogma is weakened or shattered, the morality based upon it gives way. If, the earth that he thought firm begins to rock, he himself trembles at the earthquake, for we do not all come up to the standard of the ideal Stoic who remains undaunted among the ruins of a world shattered into atoms. Happily the stuff that is underneath a man's ideas will save him. For if a man should tell you that he does not defraud or cuckold his best friend only because he is afraid of hell, you may depend upon it that neither would he do so even if he were to cease to believe in hell, but that he would invent some other excuse instead. And this is all to the honour of the human race. But he who believes that he is sailing, perhaps without a set course, on an unstable and sinkable raft, must not be dismayed if the raft gives way beneath his feet and threatens to sink. Such a one thinks that he acts, not because he deems his principle of action to be true, but in order to make it true, in order to prove its truth, in order to create his own spiritual world. My conduct must be the best proof, the moral proof, of my supreme desire; and if I do not end by convincing myself, within the bounds of the ultimate and irremediable uncertainty, of the truth of what I hope for, it is because my conduct is not sufficiently pure. Virtue, therefore, is not based upon dogma, but dogma upon virtue, and it is not faith that creates martyrs but martyrs who create faith. There is no security or repose--so far as security and repose are obtainable in this life, so essentially insecure and unreposeful--save in conduct that is passionately good. Conduct, practice, is the proof of doctrine, theory. "If any man will do His will--the will of Him that sent me," said Jesus, "he shall know of the doctrine, whether it be of God or whether I speak of myself" (John vii. 17); and there is a well-known saying of Pascal: "Begin by taking holy water and you will end by becoming a believer." And pursuing a similar train of thought, Johann Jakob Moser, the pietist, was of the opinion that no atheist or naturalist had the right to regard the Christian religion as void of truth so long as he had not put it to the proof by keeping its precepts and commandments (Ritschl, _Geschichte des Pietismus_, book vii., 43).