Final answer:
The passage suggests that Mr. Dimmesdale's friends are loyal and supportive, as they uphold his character despite clear evidence to the contrary.
Step-by-step explanation:
The passage suggests that Mr. Dimmesdale's friends are loyal and supportive of him despite clear evidence of his wrongdoing. The phrase 'that stubborn fidelity with which a man's friends-and especially a clergyman's-will sometimes uphold his character,' implies that these friends are steadfast in their defense and perhaps even in denial of the true nature of his character. They chose to maintain his good name instead of acknowledging his 'false and sin-stained' actions, which are as evident as 'the midday sunshine on the scarlet letter.'