We must now consider the cause of sin, on the part of man. Now, while man, like the devil, is the cause of another's sin, by outward suggestion, he has a certain special manner of causing sin, by way of origin. Wherefore we must speak about original sin, the consideration of which will be three-fold: (1) Of its transmission; (2) of its essence; (3) of its subject.
Under the first head there are five points of inquiry:
(1) Whether man's first sin is transmitted, by way of origin to his descendants?
(2) Whether all the other sins of our first parent, or of any other parents, are transmitted to their descendants, by way of origin?
(3) Whether original sin is contracted by all those who are begotten of Adam by way of seminal generation?
(4) Whether it would be contracted by anyone formed miraculously from some part of the human body?
(5) Whether original sin would have been contracted if the woman, and not the man, had sinned?