One day, in the month of February 1937, I happened to have five or ten loose dollars burning a hole in my pocket. I was on Fifth Avenue for some reason or other, and was attracted by the window of Scribner's bookstore, all full of bright new books. [...]

Now, in Scribner's window, I saw a book called The Spirit of Medieval Philosophy. I went inside, and took it off the shelf, and looked at the table of contents and at the title page which was deceptive, because it said the book was made up of a series of lectures that had been given at the University of Aberdeen. That was no recommendation, to me especially. But it threw me off the track as to the possible identity and character of Etienne Gilson, who wrote the book.

[...] on my way home in the Long Island train, I unwrapped the package to gloat over my acquisitions. It was only then that I saw, on the first page of The Spirit of Medieval Philosophy, the small print which said: "Nihil Obstat ... Imprimatur."

The feeling of disgust and deception struck me like a knife in the pit of the stomach. I felt as if I had been cheated! They should have warned me that it was a Catholic book! Then I would never have bought it. As it was, I was tempted to throw the thing out the window at the houses of Woodside -- to get rid of it as something dangerous and unclean. Such is the terror that is aroused in the enlightened modern mind by a little innocent Latin and the signature of a priest. It is impossible to communicate, to a Catholic, the number and complexity of fearful associations that a little thing like this can carry with it. It is in Latin -- a difficult, ancient and obscure tongue. That implies, to the mind that has roots in Protestantism, all kinds of sinister secrets, which the priests are supposed to cherish and to conceal from common men in this unknown language. Then, the mere fact that they should pass judgement on the character of a book, and permit people to read it: that in itself is fraught with terror. It immediately conjures up all the real and imaginary excesses of the Inquisition.

That is something of what I felt when I opened Gilson's book: for you must understand that while I admired Catholic culture, I had always been afraid of the Catholic Church. That is a rather common position in the world today. After all, I had not bought a book on medieval philosophy without realizing that it would be Catholic philosophy: but the imprimatur told me that what I read would be in full conformity with that fearsome and mysterious thing, Catholic Dogma, and the fact struck me with an impact against which everything in me reacted with repugnance and fear.

Now, in light of all this, I consider that it was surely a real grace that, instead of getting rid of the book, I actually read it. [...] The result was that I at once acquired an immense respect for Catholic philosophy and for the Catholic faith. And that last thing was the most important of all.

A chapter on grace in Thomas Merton's spiritual autobiography, The Seven Storey Mountain