She believed in him as an excellent man whose piety carried a peculiar eminence in belonging to a layman, whose influence had turned her own mind toward seriousness, and whose share of perishable good had been the means of raising her own position.
There are no more uses of "perishable" in the book.
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And what, in the private misery of his heart, I think he most intensely lusted to do was to inflict upon Sophie, or someone like her—some tender and perishable Christian—a totally unpardonable sin.
William Styron -- Sophie’s Choice
He knew that when he kissed this girl, and forever wed his unutterable visions to her perishable breath, his mind would never romp again like the mind of God.