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88. Man's Knowledge of Nonmaterial Things

1. Since the proper object of intellect, in the present earthlylife of man, is the essences of material things, the intellectunderstands by using phantasms, that is, sense-images of materialthings presented in imagination. Now, there are no phantasms ofnonmaterial things. Therefore, in this life, the human intellectcannot knownonmaterial things directly or per se. Itcannot know, for example, what nonmaterial substances, such asangels, are in themselves.

2. We know material things by turning the light of theagent intellect on phantasms; this is a sort of intellectual X-raywhich penetrates what is individual in the phantasms and shows uptheir essence. We call this process abstraction. We say that theintellect abstracts its ideas from phantasms. This is a kind ofprocess of de-materializing and de-individualizing material things.And we can continue this process, refining more and more, drawingideas from ideas, and reaching more and more abstract ideas. But wecan never attain by such a process to the perfect idea of spiritualsubstance as such. Spirit is an essence altogether different frommatter; hence no process of de-materializing can reveal spirit asit is in itself.

3. We cannot, therefore, have a perfect knowledge ofinfinite spirit. By reasoning we can know God's existence, andmany of the divine attributes. But to know God directly in hisspiritual essence is something we cannot have this side of heavenwith its light of glory. Therefore, here on earth and exercisingnatural powers, man cannot know God directly in himself, butindirectly by reasoning back to the First Cause of creatures.Therefore those teachers are much mistaken who hold that thefirst thing known by the human intellect is God.

"Try to turn your heart from the love of things visible and bring yourself to things invisible. For they who follow their own evil passions stain their consciences and lose the grace of God. "
Thomas á Kempis

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"Whoever wants to stand alone without the support of a master and guide will be like the tree that stands alone in a field without a proprietor. No matter how much the tree bears, passers-by will pick the fruit before it ripens. "
St John of the Cross, OCD - Doctor of the Church

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"A man should keep himself down, and not busy himself in mirabilibus super se."
St Philip Neri

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