Summa Theologiae by St. Thomas Aquinas
SS: Treatise On The Theological Virtues
Q[15] Of The Vices Opposed To Knowledge And Understanding
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Prologue   A[1]   A[2]   A[3]  

We must now consider the vices opposed to knowledge and understanding. Since, however, we have treated of ignorance which is opposed to knowledge, when we were discussing the causes of sins ([2421] FS, Q [76]), we must now inquire about blindness of mind and dulness of sense, which are opposed to the gift of understanding; and under this head there are three points of inquiry:

A[1] Whether blindness of mind is a sin?

A[2] Whether dulness of sense is a sin distinct from blindness of mind?

A[3] Whether these vices arise from sins of the flesh?