We are perpetually told, that, without a God there would be no moral obligation; that the people and even the sovereigns require a legislator powerful enough to constrain them. Moral constraint supposes a law; but this law arises from the eternal and necessary relations of things with one another; relations, which have nothing common with the existence of a God. The rules of Man's conduct are derived from his own nature which he is capable of knowing, and not from the Divine nature of which he has no idea. These rules constrain or oblige us; that is, we render ourselves estimable or contemptible, amiable or detestable, worthy of reward or of punishment, happy or unhappy, accordingly as we conform to, or deviate from these rules. The law, which obliges man not to hurt himself, is founded upon the nature of a sensible being, who, in whatever way he came into this world, is forced by his actual essence to seek good and shun evil, to love pleasure and fear pain. The law, which obliges man not to injure, and even to do good to others, is founded upon the nature of sensible beings, living in society, whose essence compels them to despise those who are useless, and to detest those who oppose their felicity.

Whether there exists a God or not, whether this God has spoken or not, the moral duties of men will be always the same, so long as they are sensible beings. Have men then need of a God whom they know not, of an invisible legislator, of a mysterious religion and of chimerical fears, in order to learn that every excess evidently tends to destroy them, that to preserve health they must be temperate; that to gain the love of others it is necessary to do them good, that to do them evil is a sure means to incur their vengeance and hatred? "Before the law there was no sin." Nothing is more false than this maxim. It suffices that man is what he is, or that he is a sensible being, in order to distinguish what gives him pleasure or displeasure. It suffices that one man knows that another man is a sensible being like himself, to perceive what is useful or hurtful to him. It suffices that man needs his fellow-creature, in order to know that he must fear to excite sentiments unfavourable to himself. Thus the feeling and thinking being has only to feel and think, in order to discover what he must do for himself and others. I feel, and another feels like me; this is the foundation of all morals.