This is a difficult point and many systems have been invented to explain it: it will suffice to give the theological explanation now commonly received.** Original sin is the privation of sanctifying grace in consequence of the sin of Adam**. This solution, which is that of St. Thomas, goes back to St. Anselm and even to the traditions of the early Church, as we see by the declaration of the Second Council of Orange (A.D. 529): one man has transmitted to the whole human race not only the death of the body, which is the punishment of sin, but even sin itself, which is the death of the soul [Denz., n. 175 (145)]. As death is the privation of the principle of life, the death of the soul is the privation of sanctifying grace which according to all theologians is the principle of supernatural life. Therefore, if original sin is “the death of the soul”, it is the privation of sanctifying grace.