We shall always be liable to err, when we judge of the opinions of men by their conduct, or of their conduct by their opinions. A religious man, notwithstanding the unsociable principles of a sanguinary religion, will sometimes by a happy inconsistency, be humane, tolerant, and moderate; the principles of his religion do not then agree with the gentleness of his character. Libertines, debauchees, hypocrites, adulterers, and rogues, often appear to have the best ideas upon morals. Why do they not reduce them to practice? Because their temperament, their interest, and their habits do not accord with their sublime theories. The rigid principles of Christian morality, which many people regard as divine, have but little influence upon the conduct of those, who preach them to others. Do they not daily tell us, _to do what they preach, and not what they practise?_ The partisans of Religion often denote an infidel by the word _libertine_. It is possible that many unbelievers may have loose morals, which is owing to their temperament, and not to their opinions. But how does their conduct affect their opinions? Cannot then an immoral man be a good physician, architect, geometrician, logician, or metaphysician? A man of irreproachable conduct may be extremely deficient in knowledge and reason. In quest of truth, it little concerns us from whom it comes. Let us not judge men by their opinions, nor opinions by men; let us judge men by their conduct, and their opinions by their conformity with experience and reason and by their utility to mankind. 182. Every man, who reasons, soon becomes an unbeliever; for reason shows, that theology is nothing but a tissue of chimeras; that religion is contrary to every principle of good sense, that it tinctures all human knowledge with falsity. The sensible man is an unbeliever, because he sees, that, far from making men happier, religion is the chief source of the greatest disorders, and the permanent calamities, with which man is afflicted. The man, who seeks his own welfare and tranquillity, examines and throws aside religion, because he thinks it no less troublesome than useless, to spend his life in trembling before phantoms, fit to impose only upon silly women or children. If licentiousness, which reasons but little, sometimes leads to irreligion, the man of pure morals may have very good motives for examining his religion, and banishing it from his mind. Religious terrors, too weak to impose upon the wicked in whom vice is deeply rooted, afflict, torment and overwhelm restless imaginations. Courageous and vigorous minds soon shake off the insupportable yoke. But those, who are weak and timorous, languish under it during life; and as they grow old their fears increase.