The danger for their opponent is serious. A narrow-minded man, finding in their writings moral philosophy mixed with unsupported theories, believes that he ought to entirely reject them and to condemn those who profess them. Having only heard them from their mouth he does not hesitate in his ignorance to declare them false because those who teach them are in error. It is as if some one was to reject the profession of faith made by Christians, "There is only one God and Jesus is his prophet," simply because it proceeds from Christians and without inquiring whether it is the profession of this creed or the denial of Mohammed's prophetic mission which makes Christians infidels. Now, if they are only infidels because of their rejection of our Prophet, we are not entitled to reject those of their doctrines which do not wear the stamp of infidelity. In a word, truth does not cease to be true because it is found among them. Such, however, is the tendency of weak minds: they judge the truth according to its professors instead of judging its professors by the standard of the truth. But a liberal spirit will take as its guide this maxim of the prince of believers, Ali the son of Abu Talib: "Do not seek for the truth by means of men; find first the truth and then you will recognize those who follow it." This is the procedure followed by a wise man. Once in possession of the truth he examines the basis of various doctrines which come before him, and when he has found them true, he accepts them without troubling himself whether the person who teaches them is sincere or a deceiver. Much rather, remembering how gold is buried in the bowels of the earth, he endeavors to disengage the truth from the mass of errors in which it is engulfed. The skilled coin-assayer plunges without hesitation his hand into the purse of the coiner of false money, and relying on experience, separates good coins from bad. It is the ignorant rustic, and not the experienced assayer, who will ask why we should have anything to do with a false coiner. The unskilled swimmer must be kept away from the seashore, not the expert in diving. The child, not the charmer, must be forbidden to handle serpents. As a matter of fact, men have such a good opinion of themselves, of their mental superiority and intellectual depth; they believe themselves so skilled in discerning the true from the false, the path of safety from those of error, that they should be forbidden as much as possible the perusal of philosophic writings, for though they sometimes escape the danger just pointed out, they can not avoid that which we are about to indicate.