A theist, very estimable for his talents, asks, "if there can be any other cause than an evil disposition, which can make men atheists?" I reply to him, yes, there are other causes. There is the desire, a very laudable one, of having a knowledge of interesting truths; there is the powerful interest of knowing what opinions we ought to hold upon the object which is announced to us as the most important; there is the fear of deceiving ourselves upon systems which are occupied with the opinions of mankind, which do not permit he should deceive himself respecting them with impunity. But when these motives, these causes, should not subsist, is not indignation, or if they will, an evil disposition, a legitimate cause, a good and powerful motive, for closely examining the pretensions, for searching into the rights of systems, in whose name so many crimes are perpetrated? Can any man who feels, who thinks, who has any elasticity in his soul, avoid being incensed against austere theories, which are visibly the pretext, undeniably the source, of all those evils, which on every side assail the human race? Are they not these fatal systems which are at once the cause and the ostensible reason of that iron yoke that oppresses mankind; of that wretched slavery in which he lives; of that blindness which hides from him his happiness; of that superstition, which disgraces him; of those irrational customs which torment him; of those sanguinary quarrels which divide him; of all the outrages which he experiences? Must not every breast in which humanity is not extinguished, irritate itself against that theoretical speculation, which in almost every country is made to speak the language of capricious, inhuman, irrational tyrants?