If the provinces of faith and reason are not kept distinct by these boundaries, there will, in matters of religion, be no room for reason at all; and those extravagant opinions and ceremonies that are to be found in the several religions of the world will not deserve to be blamed. For, to this crying up of faith in OPPOSITION to reason, we may, I think, in good measure ascribe those absurdities that fill almost all the religions which possess and divide mankind. For men having been principled with an opinion, that they must not consult reason in the things of religion, however apparently contradictory to common sense and the very principles of all their knowledge, have let loose their fancies and natural superstition; and have been by them led into so strange opinions, and extravagant practices in religion, that a considerate man cannot but stand amazed, at their follies, and judge them so far from being acceptable to the great and wise God, that he cannot avoid thinking them ridiculous and offensive to a sober good man. So that, in effect, religion, which should most distinguish us from beasts, and ought most peculiarly to elevate us, as rational creatures, above brutes, is that wherein men often appear most irrational, and more senseless than beasts themselves. CREDO, QUIA IMPOSSIBILE EST: I believe, because it is impossible, might, in a good man, pass for a sally of zeal; but would prove a very ill rule for men to choose their opinions or religion by. CHAPTER XIX. [not in early editions] CHAPTER XX. OF WRONG ASSENT, OR ERROR. 1. Causes of Error, or how men come to give assent contrary to probability. KNOWLEDGE being to be had only of visible and certain truth, ERROR is not a fault of our knowledge, but a mistake of our judgment giving assent to that which is not true. But if assent be grounded on likelihood, if the proper object and motive of our assent be probability, and that probability consists in what is laid down in the foregoing chapters, it will be demanded HOW MEN COME TO GIVE THEIR ASSENTS CONTRARY TO PROBABILITY. For there is nothing more common than contrariety of opinions; nothing more obvious than that one man wholly disbelieves what another only doubts of, and a third steadfastly believes and firmly adheres to. The reasons whereof, though they may be very various, yet, I suppose may all be reduced to these four: I. WANT OF PROOFS. II. WANT OF ABILITY TO USE THEM. III. WANT OF WILL TO SEE THEM. IV. WRONG MEASURES OF PROBABILITY. 2. First cause of Error, Want of Proofs.