Both Uses

pious
in
The Minister's Black Veil
(Edited)

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.

piety = religious belief
There were the deacons, and other eminently pious members of his church.
*

pious = highly religious and moral

Definitions:

(1) (pious as in: a good, pious woman)
religious or highly moral
(2) (pious as in: a pious hypocrite)
self-righteous (acting as though one is, or believing one is highly moral when it is not true)
(3) (pious as in: cling to the pious hope)
(describing a hope or wish as) sincere, but highly unlikely
(4) (meaning too rare to warrant focus)
Much more rarely, piety can refer to devotion or faithfulness as Proust used it in the book, Swann's Way:

"...but when, as had befallen me, such an anguish possesses one's soul before Love has yet entered into one's life, then it must drift, awaiting Love's coming, vague and free, without precise attachment, at the disposal of one sentiment to-day, of another to-morrow, of filial piety or affection for a comrade."