You should always contact the publisher in cases like these. The copyright to this kind of material will be closely held, especially if it is held by a company, as is likely the case with Houghton Mifflin. It won't matter if it's the 1st edition or not, the copyright is probably still active and will be so long as the company is.
Contact the publisher regardless of your having paraphrased the material. This simply creates a potentially uncomfortable situation, and they should know about it. Larger publishers have entire rights departments for this sort of thing, and many of them have lawyers too.
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Knowing that death is certain and that the time of death is uncertain, what's the most important thing?
—Bhikkhuni Pema Chödrön
Humankind cannot bear very much reality.
—From "Burnt Norton," Four Quartets (1936), T. S. Eliot
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