He Blinded their eyes.

Spiritual pride “gives us such confidence in our reason and judgment that we are not very willing to consult others, especially our superiors, or to enlighten ourselves by the attentive and benevolent examination of reasons or facts which may be urged against us. This state of mind leads to manifest imprudent acts that will have to be painfully expiated. It leads also to asperity in discussions, to stubbornness in judgment, to disparagement which excludes in a cutting tone all that does not fit in with our manner of seeing things. This pride may lead a person to refuse to others the liberty he claims for his own opinions, and also to submit only very imperfectly to the directions of the supreme Shepherd, and even to attenuate and minimize dogmas under the pretext of explaining them better than has been done hitherto...Spiritual pride is connected with “pertinacity.” Pertinacity is a vice that falsifies or disfigures perseverance. It is a false perseverance which applies the will’s tenacity to something that it shouldn’t be applied to. Perseverance inclines us to persist in doing good; pertinacity makes us persist and remain fixed in an opinion when there are authoritative reasons to doubt it. Together with Saint Isidore, Saint Thomas writes “a person is said to be pertinacious who holds on impudently” and also those who “abide by their opinions more than they should.”