Whether sin can be in the reason?

❌ Objection 1 : It would seem that sin cannot be in the reason. For the sin of any power is a defect thereof. But the fault of the reason is not a sin, on the contrary, it excuses sin: for a man is excused from sin on account of ignorance. Therefore sin cannot be in the reason.

❌ Objection 2 : Further, the primary object of sin is the will, as stated above (Article [1]). Now reason precedes the will, since it directs it. Therefore sin cannot be in the reason.

❌ Objection 3 : Further, there can be no sin except about things which are under our control. Now perfection and defect of reason are not among those things which are under our control: since by nature some are mentally deficient, and some shrewd-minded. Therefore no sin is in the reason.