Summa Theologica by St. Thomas Aquinas
FS: Treatise On Habits In Particular
Q[82] Of Original Sin, As To Its Essence
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We must now consider original sin as to its essence, and under this head there are four points of inquiry:

A[1] Whether original sin is a habit?

A[2] Whether there is but one original sin in each man?

A[3] Whether original sin is concupiscence?

A[4] Whether original sin is equally in all?