The Answer to this may be easily found from what is already said. Had we no moral Sense natural to us, we should only look upon Incest as hurtful to ourselves, and shun it, and never disapprove other incestuous Persons, more than we do a broken Merchant; so that still this Abhorrence supposes a Sense of moral Good. And farther, it is true, that many who abhor Incest do not know, or reflect upon the natural tendency of some sorts of Incest to the publick Detriment; but where-ever it is hated, it is apprehended as offensive to the Deity, and that it exposes the Person concern'd to his just Vengeance. Now it is universally acknowledg'd to be the grossest Ingratitude and Baseness, in any Creature, to counteract the Will of the Deity, to whom it is under such Obligations. This then is plainly a moral evil Quality apprehended in Incest, and reducible to the general Foundation of Malice, or rather Want of Benevolence. Nay further, where this Opinion, That Incest is offensive to the Deity,
prevails, Incest must have another direct Contrariety to Benevolence; since we must apprehend the Incestuous, as exposing an Associate, who should be dear to him by the Ties of Nature, to the lowest State of Misery and Baseness, Infamy and Punishment. But in those Countrys where no such Opinion prevails of the Deity's abhorring or prohibiting Incest; if no obvious natural Evils attend it, it may be look'd upon as innocent. And further, as Men who have the Sense of Tasting, may, by Company and Education, have Prejudices against Meats they never tasted, as unsavoury; so may Men, who have a moral Sense, acquire an Opinion by implicit Faith, of the moral Evil of Actions, altho' they do not themselves discern in them any tendency to natural Evil; imagining that others do: or, by Education, they may have some Ideas associated, which raise an abhorrence without Reason. But without a moral Sense we could receive no Prejudice against Actions, under any other View than as naturally disadvantageous to ourselves.