Summa Theologiae by St. Thomas Aquinas
FS: Treatise On Habits In Particular
Q[80] Of The Cause Of Sin, As Regards The Devil
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We must now consider the cause of sin, as regards the devil; and under this head there are four points of inquiry:

A[1] Whether the devil is directly the cause of sin?

A[2] Whether the devil induces us to sin, by persuading us inwardly?

A[3] Whether he can make us sin of necessity?

A[4] Whether all sins are due to the devil's suggestion?