What evidence in the text hints at or suggests Mr. Hooper's reasons for wearing the black veil?

The first hint we get
about the meaning of the veil is the subject of the first sermon Mr. Hooper delivers after he
begins to wear it. "The subject had reference to secret sin, and those sad mysteries which
we hide from our nearest and dearest, and would fain conceal from our own consciousness
[...]." His congregation even feels that he's "discovered their hoarded iniquity of
deed or thought."

Then, when his fiancee,...