In seeking the answer to this question, we at once note the suggestive fact that this law concerning issues takes cognisance only of such as are connected with the sexual organisation. All others, however, in themselves, from a merely physical point of view, equally unwholesome or loathsome, are outside the purview of the Mosaic code. They do not render the person affected, according to the law, ceremonially unclean. It is therefore evident that the lawgiver must have had before him something other than merely the physical peculiarities of these defilements, and that, for the true meaning of this part of the law, we must look deeper than the surface. It should also be observed here that this characteristic of the law just mentioned, places the law of issues under the same general category with the law (chap. xii.) concerning the uncleanness of child-bearing, as indeed the latter itself intimates (xii. 2). The question thus arises: Why are these particular cases, and such as these only, regarded as ceremonially defiling? To see the reason of this, we must recur to facts which have already come before us. When our first parents sinned, death was denounced against them as the penalty of their sin. Such had been the threat: "In the day that thou eatest thereof, thou shalt die." The death denounced indeed affected the whole being, the spiritual as well as the physical nature of man; but it comprehended the death of the body, which thus became, what it still is, the most impressive manifestation of the presence of sin in every person who dies. Hence, as we have seen, the law kept this connection between sin and death steadily before the mind, in that it constantly applied the principle that the dead defiles. Not only so, but, for this reason, such things as tended to bring death were also reckoned unclean; and thus the regulations of the law concerning clean and unclean meats, while strictly hygienic in character, were yet grounded in this profound ethical fact of the connection between sin and death; had man not sinned, nothing in the world had been able to bring in death, and all things had been clean. For the same reason, again, leprosy, as exemplifying in a vivid and terrible way disease as a progressive death, a living manifestation of the presence of the curse of God, and therefore of the presence of sin, a type of all disease, was regarded as involving ceremonial defilement, and therefore as requiring sacrificial cleansing.