Summa Theologica by St. Thomas Aquinas
FS: Treatise On Habits In Particular
Q[81] Of The Cause Of Sin, On The Part Of Man
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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:

A[1] Whether man's first sin is transmitted, by way of origin to his descendants?

A[2] Whether all the other sins of our first parent, or of any other parents, are transmitted to their descendants, by way of origin?

A[3] Whether original sin is contracted by all those who are begotten of Adam by way of seminal generation?

A[4] Whether it would be contracted by anyone formed miraculously from some part of the human body?

A[5] Whether original sin would have been contracted if the woman, and not the man, had sinned?