But tho' these are ties upon mankind, which make the conjugal bonds more firm and lasting in man, than the other species of animals; yet it would give one reason to enquire, why this compact, where procreation and education are secured, and inheritance taken care for, may not be made determinable, either by consent, or at a certain time, or upon certain conditions, as well as any other voluntary compacts, there being no necessity in the nature of the thing, nor to the ends of it, that it should always be for life; I mean, to such as are under no restraint of any positive law, which ordains all such contracts to be perpetual.