229. The question is here usually asked, To what persons could the words of Cain possibly apply, when he says, "Everyone that findeth me shall slay me," when it is evident that besides Adam and Eve and their few daughters, no human beings were in existence. I would at once reply that they bear witness to the fact that we see the wicked "flee when no man pursueth," as the Scriptures say; for they imagine to themselves various perils where none really exist. Just so we see it to be the case with murderers at the present day, who are filled with fears where all is safe, who can remain quiet nowhere, and who imagine death to be present everywhere. 230. However, when it follows in the command of God, "Yea, verily, whosoever slayeth Cain shall be punished sevenfold," these words cannot be referred exclusively to the fears of Cain, for Cain had sisters, and perhaps he greatly dreaded that sister whom he had married, lest she should take vengeance on him for the murder of her brother. Moreover, Cain had perhaps a vague apprehension of a long life, and he saw that many more sons might be born of Adam. He feared, therefore, the whole posterity to Adam. And it greatly increased these fears that God had left him nothing more than his stray mercy. I do not think that Cain feared the beasts at all, or dreaded being slain by them; for what had the sevenfold vengeance threatened upon murderers to do with beasts? V. 15b. _And Jehovah appointed a sign for (set a mark upon) Cain, lest any finding him should smite him (slay him)._ 231. What this mark was is not to be found in the Holy Scriptures. Therefore commentators have entertained various opinions. Nearly all, however, have come to this one conclusion--they have inferred that there was apparent in Cain a great tremor of his head and of all his limbs. They suppose that, as a physical cause of his trembling, God had changed, or disarranged, or mutilated some particular organ in his body, but left the body whole as it was first created, merely adding a visible outward mark, such as the trembling. This conjecture of the fathers contains much probability, but it cannot be proved by any testimony of the Scriptures. The mark might have been of another kind. For instance, we observe in nearly all murderers an immediate change in the eyes. The eyes wear an appearance of sullen ferocity, and lose that softness and innocence peculiar to them by nature.