Here, Madam, you have a short but perfect summary of all morals, derived, as they must be, from the nature of man, the uniform experience and the universal reason of mankind. These precepts are compulsory upon our minds, for they show us that the consequences of our conduct flow from our actions with as natural and inevitable a certainty as the return of a stone to the earth after the impetus is exhausted which detained it in the air. It is natural and inevitable that the man who employs himself in doing good must be preferred to the man who does mischief. Every thinking being must be penetrated with the truth of this incontrovertible maxim, and all the ponderous volumes of theology that ever were composed can add nothing to the force of his conviction; every thinking being will, therefore, avoid a conduct calculated to injure either himself or others; he will feel himself under the necessity of doing good to others, as the only method of obtaining solid happiness for himself, and of conciliating to himself those sentiments on the part of others, without which he could derive no charms from society. You perceive, then, Madam, that _faith_ cannot in any manner contribute to the correction of social conduct, and you will feel that the popular super-natural notions cannot add any thing to the obligations that our nature imposes upon us. In fact, the more mysterious and incomprehensible are the dogmas of the church, the more likely are they to draw us aside from the plain dictates of Nature and the straight-forward directions of Reason, whose voice is incapable of misleading us. A candid survey of the causes which produce an infinity of evils that afflict society will quickly point out the speculative tenets of theology as their most fruitful source. The intoxication of enthusiasm and the frenzy of fanaticism concur in overpowering reason, and by rendering men blind and unreflecting, convert them into enemies both of themselves and the rest of the world. It is impossible for the worshippers of a tyrannical, partial, and cruel God to practise the duties of justice and philanthropy. As soon as the priests have succeeded in stifling within us the commands of Reason, they have already converted us into slaves, in whom they can kindle whatever passions it may please them to inspire us with. Their interest, indeed, requires that we should be slaves. They exact from us the surrender of our reason, because our reason contradicts their impostures, and would ruin their plans of aggrandizement. Faith is the instrument by which they enslave us and make us subservient to their own ambition. Hence arises their zeal for the propagation of the faith; hence arises their implacable hostility to science, and to all those who refuse submission to their yoke; hence arises their incessant endeavor to establish the dominion of Faith, (that is to say, their own dominion,) even by fire and sword, the only arguments they condescend to employ.