Front Page Titles (by Subject) QUESTION XLVI.: OF STUPIDITY. - Aquinas Ethicus: or, the Moral Teaching of St. Thomas, vol. 1 (Summa Theologica - Prima Secundae, Secunda Secundae Pt.1)
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QUESTION XLVI.: OF STUPIDITY. - St. Thomas Aquinas, Aquinas Ethicus: or, the Moral Teaching of St. Thomas, vol. 1 (Summa Theologica - Prima Secundae, Secunda Secundae Pt.1) 
Aquinas Ethicus: or, the Moral Teaching of St. Thomas. A Translation of the Principal Portions of the Second part of the Summa Theologica, with Notes by Joseph Rickaby, S.J. (London: Burns and Oates, 1892).
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Article II.—Is stupidity a sin?
R. Stupidity implies a dulness of perception in judging, particularly about the Highest Cause, the Last End and Sovereign Good. This may come of natural incapacity, and that is not a sin. Or it may come of man burying his mind so deep in earthly things as to render his perceptions unfit to grasp the things of God, according to the text: “The sensual man perceiveth not these things that are of the Spirit of God;”1 and such stupidity is a sin.
§ 2. Though no one wishes to be stupid, still people do wish for what leads to stupidity, by withdrawing their thoughts from things spiritual and burying them in things of earth. So it is also with other sins: for the lustful man wants the pleasure, to which the sin is attached, though he does not absolutely wish for the sin; for he would like to enjoy the pleasure without the sin.
[1 ]1 Cor. ii. 14.