Here's why:
* Symbolism of the Veil: The black veil represents the secrets, sins, and hidden aspects of humanity. It's a physical embodiment of the universal human condition, something that everyone carries.
* Death as a Revelation: Death is often seen as a time when all facades are stripped away. We are revealed in our true selves, stripped of earthly possessions and social roles. This is a powerful concept that resonates throughout the story.
* Universality: The parson's statement suggests that everyone, including Elizabeth, will ultimately face death. The veil, in this context, represents the masks we wear in life, which are ultimately meaningless in the face of mortality.
* The Parson's Own Veil: The parson's own veil serves as a constant reminder of this truth. He wears it every day, symbolizing his awareness of the inevitable end and the hidden aspects of human existence.
By saying, "There is an hour to come when all of us shall cast aside your veils," Parson Hooper is essentially saying that death will reveal the truth about everyone, including Elizabeth. It's a reminder that we are all equal in the face of mortality and that the masks we wear in life hold little meaning in the grand scheme of things.