To make him perpetually miserable. Sin is contagious. Example is the highest moral influence that can be exerted. Consequently the disobedience of one tends to beget disobedience in others. And sin, if not counteracted, tends as naturally to spread and become universal, as a contagious disease does.
Sin tends to total and universal selfishness.
It tends to universal damnation. It tends to bring the authority of God into universal contempt. It tends to overthrow all government, all happiness. And as all rebellion is aimed at the throne and the life of the sovereign, the natural tendency of sin is not only to annihilate the authority, but the very being of God. Thus, in this respect also, sin involves infinite guilt.