Last “Doors” excerpt for ya…this quote ends the book:
This (spiritual) given reality is an infinite which passes all understanding and yet admits of being directly and in some sort totally apprehended. It is a transcendence belonging to another order than the human, and yet it may be present to us as a felt immanence, an experienced participation. To be enlightened is to be aware, always, of total reality in its immanent otherness—to be aware of it and yet to remain in a condition to survive as an animal, to think and feel as a human being, to resort whenever expedient to systematic reasoning. Our goal is to discover that we have always been where we ought to be. Unhappily we make the task exceedingly difficult for ourselves. Meanwhile, however, there are gratuitous graces in the form of partial and fleeting realizations. Under a more realistic, a less exclusively verbal system of education than ours, every Angel (in Blake’s sense of that word) would be permitted as a sabbatical treat, would be urged and even, if necessary, compelled to take an occasional trip through some chemical Door in the Wall into the world of transcendental experience. If it terrified him, it would be unfortunate but probably salutary. If it brought him a brief but timeless illumination, so much the better. In either case the Angel might lose a little of the confident insolence sprouting from systematic reasoning and the consciousness of having read all the books.
Near the end of his life Aquinas experienced Infused Contemplation. Thereafter he refused to go back to work on his unfinished book. Compared with this, everything he had read and argued about and written—Aristotle and the Sentences, the Questions, the Propositions, the majestic Summas—was no better than chaff or straw. For most intellectuals such a sit-down strike would be inadvisable, even morally wrong. But the Angelic Doctor had done more systematic reasoning than any twelve ordinary Angels, and was already ripe for death. He had earned the right, in those last months of his mortality, to turn away from merely symbolic straw and chaff to the bread of actual and substantial Fact. For Angels of a lower order and with better prospects of longevity, there must be a return to the straw. But the man who comes back through the Door in the Wall will never be quite the same as the man who went out. He will be wiser but less cocksure, happier but less self-satisfied, humbler in acknowledging his ignorance yet better equipped to understand the relationship of words to things, of systematic reasoning to the unfathomable Mystery which it tries, forever vainly, to comprehend.
-Aldous Huxley, The Doors of Perception