Line 389. In what way did the veil make Mr.Hooper a popular minister?

From the text:

"Among all its bad influences, the black veil had the one desirable effect, of making its wearer a very efficient clergyman. By the aid of his mysterious emblem--for there was no other apparent cause--he became a man of awful power over souls that were in agony for sin. His converts always regarded him with a dread peculiar to themselves, affirming, though but figuratively, that, before he brought them to celestial light, they had been with him behind the black veil. Its gloom, indeed, enabled him to sympathize with all dark affections. Dying sinners cried aloud for Mr. Hooper, and would not yield their breath till he appeared; though ever, as he stooped to whisper consolation, they shuddered at the veiled face so near their own. Such were the terrors of the black veil, even when Death had bared his visage! Strangers came long distances to attend service at his church, with the mere idle purpose of gazing at his figure, because it was forbidden them to behold his face. But many were made to quake ere they departed! Once, during Governor Belcher's administration, Mr. Hooper was appointed to preach the election sermon. Covered with his black veil, he stood before the chief magistrate, the council, and the representatives, and wrought so deep an impression that the legislative measures of that year were characterized by all the gloom and piety of our earliest ancestral sway."