Without disputing a truth so momentous, we must be allowed to consider this version of Mr. Dimmesdale’s story as only an instance of that stubborn fidelity with which a man’s friends—and especially a clergyman’s—will sometimes uphold his character, when proofs, clear as the mid-day sunshine on the scarlet letter, establish him a false and sin-stained creature of the dust.
There are no more uses of "fidelity" in the book.
Show samples from other sources
But it was only decent, and now I was a cheater, and I couldn’t ruin my record of fidelity on something merely average.
Gillian Flynn -- Gone Girl
That opening is scientifically and mathematically positioned by a factory-trained technician to enhance the TT AB-700’s true high-fidelity sound!"
Christopher Paul Curtis -- The Watsons Go to Birmingham—1963