"How they, who are arrived at the aforesaid unitive state, have the eye of their intellect illuminated by supernatural light infused by grace"- "THE DIALOGUE" OF SAINT CATHERINE OF SIENA - Translated by Algar Thorold; #25
"With this light that is given to the eye of the intellect, Thomas Aquinas saw Me, wherefore he acquired the light of much science; also Augustine, Jerome, and the doctors, and my saints. They were illuminated by My Truth to know and understand My Truth in darkness. By My Truth I mean the Holy Scripture, which seemed dark because it was not understood; not through any defect of the Scriptures, but of them who heard them, and did not understand them.
Wherefore I sent this light to illuminate the blind and coarse understanding, uplifting the eye of the intellect to know the Truth. And I, Fire, Acceptor of sacrifices, ravishing away from them their darkness, give the light; not a natural light, but a supernatural, so that, though in darkness, they know the Truth.
Wherefore that, which at first appeared to be dark, now appears with the most perfect light, to the gross or subtle mind; and everyone receives according as he is capable or disposed to know Me, for I do not despise dispositions. So you see that the eye of the intellect has received supernatural light, infused by grace, by which the doctors and saints knew light in darkness, and of darkness made light.
The intellect was, before the Scriptures were formed, wherefore, from the intellect came science, because in seeing they discerned. It was thus that the holy prophets and fathers understood, who prophesied of the coming and death of My Son, and the Apostles, after the coming of the Holy Spirit, which gave them that supernatural light. The evangelists, doctors, professors, virgins, and martyrs were all likewise illuminated by the aforesaid perfect light. And everyone has had the illumination of this light according as he needed it for his salvation or that of others, or for the exposition of the Scriptures.
The doctors of the holy science had it, expounding the doctrine of My Truth, the preaching of the Apostles, and the Gospels of the Evangelists. The martyrs had it, declaring in their blood the Most Holy Faith, the fruit and the treasure of the Blood of the Lamb. The virgins had it in the affection of charity and purity. To the obedient ones is declared, by it, the obedience of the Word, showing them the perfection of obedience, which shines in my Truth, who for the obedience that I imposed upon Him, ran to the opprobrious death of the Cross."
Giovanni di Paolo - Saint Thomas Aquinas Confounding Averroes: