Whoever considers the length and feebleness of human infancy, with the concern which both sexes naturally have for their offspring, will easily perceive, that there must be an union of male and female for the education of the young, and that this union must be of considerable duration. But, in order to induce the men to impose on themselves this restraint, and undergo cheerfully all the fatigues and expenses to which it subjects them, they must believe that their children are their own, and that their natural instinct is not directed to a wrong object, when they give a loose to love and tenderness. Now, if we examine the structure of the human body, we shall find, that this security is very difficult to be attained on our part; and that since, in the copulation of the sexes, the principle of generation goes from the man to the woman, an error may easily take place on the side of the former, though it be utterly impossible with regard to the latter. From this trivial and anatomical observation is derived that vast difference betwixt the education and duties of the two sexes. Were a philosopher to examine the matter a _priori_, he would reason after the following manner. Men are induced to labour for the maintenance and education of their children, by the persuasion that they are really their own; and therefore 'tis reasonable, and even necessary, to give them some security in this particular. This security cannot consist entirely in the imposing of severe punishments on any transgressions of conjugal fidelity on the part of the wife; since these public punishments cannot be inflicted without legal proof, which 'tis difficult to meet with in this subject. What restraint, therefore, shall we impose on women, in order to counterbalance so strong a temptation as they have to infidelity? There seems to be no restraint possible, but in the punishment of bad fame or reputation; a punishment which has a mighty influence on the human mind, and at the same time is inflicted by the world upon surmises and conjectures, and proofs that would never be received in any court of judicature. In order, therefore, to impose a due restraint on the female sex, we must attach a peculiar degree of shame to their infidelity, above what arises merely from its injustice, and must bestow proportionable praises on their chastity.