Gregory the Dialogist

Then I said, I shall die in my nest, and I shall multiply my days as a palm. What else is set forth in this place by the title of a 'nest,' but the tranquil rest of the faith whereby every infirm soul is nourished? For that multitude of the good, which shall be overtaken by the times of persecution, thought to accomplish the days of its nourishings, as in a nest, so in a place of repose. …

Morals on the Book of Job, Book XIX ↗

Thomas Aquinas

Because of all these good works, he was confident that his prosperity would endure. He describes the continuity of his prosperity first in his own person, and so he says, "And I said, 'I will die in my little nest,'" because I hoped from my past merits that I would quietly die in my house, not exiled from my house, nor even in a troubled house. Nor yet did he believe that he should worry about a timely death, and so he says, "like a palm tree," which lives a very long time, "I will multiply my days," in the great length of my life.

Commentary on Job ↗