Summa Theologica by St. Thomas Aquinas
FS: Treatise On Habits In Particular
Q[76] Of The Causes Of Sin, In Particular
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Prologue   A[1]   A[2]   A[3]   A[4]  

We must now consider the causes of sin, in particular, and (1) The internal causes of sin; (2) its external causes; and (3) sins which are the causes of other sins. In view of what has been said above [1765] (A [2]), the first consideration will be threefold: so that in the first place we shall treat of ignorance, which is the cause of sin on the part of reason; secondly, of weakness or passion, which is the cause of sin on the part of the sensitive appetite; thirdly, of malice, which is the cause of sin on the part of the will.

Under the first head, there are four points of inquiry:

A[1] Whether ignorance is a cause of sin?

A[2] Whether ignorance is a sin?

A[3] Whether it excuses from sin altogether?

A[4] Whether it diminishes sin?