Whether the intellect can be false?
Objections
❌ Objection 1 : It would seem that the intellect can be false; for the Philosopher says (Metaph. vi, Did. v, 4) that "truth and falsehood are in the mind." But the mind and intellect are the same, as is shown above (Question [79], Article [1]). Therefore falsehood may be in the mind.
❌ Objection 2 : Further, opinion and reasoning belong to the intellect. But falsehood exists in both. Therefore falsehood can be in the intellect.
❌ Objection 3 : Further, sin is in the intellectual faculty. But sin involves falsehood: for "those err that work evil" (Prov. 14:22). Therefore falsehood can be in the intellect.