Affected ignorance does not excuse from guilt, but seems, rather, to aggravate it: for it shows that a man is so strongly attached to sin that he wishes to incur ignorance lest he avoid sinning.
 Thomas Aquinas, Summa Theologica (1274). copy citation

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Author Thomas Aquinas
Source Summa Theologica
Topic guilt ignorance
Date 1274
Language English
Reference
Note Translated by Fathers of the English Dominican Province
Weblink http://www.gutenberg.org/cache/epub/19950/pg19950-images.html

Context

“"But now they have both seen and hated both Me and My Father." Now all this shows that while they beheld Christ's marvelous works, it was owing to their hatred that they did not know Him to be the Son of God. Reply Obj. 3: Affected ignorance does not excuse from guilt, but seems, rather, to aggravate it: for it shows that a man is so strongly attached to sin that he wishes to incur ignorance lest he avoid sinning. The Jews therefore sinned, as crucifiers not only of the Man-Christ, but also as of God. _______________________ SIXTH ARTICLE [III, Q. 47, Art. 6] Whether the Sin of Those Who Crucified Christ Was Most Grievous?” source