Whether the gift of understanding is found also in those who have not sanctifying grace?

Objections

Objection 1 : It would seem that the gift of understanding is found also in those who have not sanctifying grace. For Augustine, in expounding the words of Ps. 118:20: "My soul hath coveted to long for Thy justifications," says: "Understanding flies ahead, and man's will is weak and slow to follow." But in all who have sanctifying grace, the will is prompt on account of charity. Therefore the gift of understanding can be in those who have not sanctifying grace.
Objection 2 : Further, it is written (Dan. 10:1) that "there is need of understanding in a" prophetic "vision," so that, seemingly, there is no prophecy without the gift of understanding. But there can be prophecy without sanctifying grace, as evidenced by Mt. 7:22, where those who say: "We have prophesied in Thy name [*Vulg.: 'Have we not prophesied in Thy name?]," are answered with the words: "I never knew you." Therefore the gift of understanding can be without sanctifying grace.
Objection 3 : Further, the gift of understanding responds to the virtue of faith, according to Is. 7:9, following another reading [*The Septuagint]: "If you will not believe you shall not understand." Now faith can be without sanctifying grace. Therefore the gift of understanding can be without it.