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- When the fact that one is a total nonentity who's done nothing more outstanding than eating, sleeping and chatting with neighbors becomes a fact worthy of pride, of announcement to the world and of diligent study by millions of readers—the fact that one has built a cathedral becomes unrecordable and unannounceable.3.6 — Part 3 Chapter 6 (45% in)
There are no more uses of "diligent" in The Fountainhead.
Typical Usage (best examples)