Pearl's inevitable tendency to hover about the enigma of the scarlet letter seemed an innate quality of her being. From the earliest epoch of her conscious life, she had entered upon this as her appointed mission. Hester had often fancied that Providence had a design of justice and retribution, in endowing the child with this marked propensity; but never, until now, had she bethought herself to ask, whether, linked with that design, there might not likewise be a purpose of mercy and beneficence. If little Pearl were entertained with faith and trust, as a spirit messenger no less than an earthly child, might it not be her errand to soothe away the sorrow that lay cold in her mother's heart, and converted it into a tomb?- and to help her to overcome the passion, once so wild, and even yet neither dead nor asleep, but only imprisoned within the same tomb-like heart?

Such were some of the thoughts that now stirred in Hester's mind, with as much vivacity of impression as if they had actually been whispered into her ear. And there was little Pearl, all this while, holding her mother's hand in both her own, and turning her face upward, while she put these searching questions, once, and again and still a third time.

"What does the letter mean, mother?- and why dost thou wear it?- and why does the minister keep his hand over his heart?"

…

"Silly Pearl," said she, "what questions are these? There are many things in this world that a child must not ask about. What know I of the minister's heart? And as for the scarlet letter, I wear it for   the sake of its gold thread."

In all the seven bygone years, Hester Prynne had never before been false to the symbol on her bosom. It may be that it was the talisman of a stern and severe, but yet a guardian spirit, who now forsook her; as recognizing that, in spite of his strict watch over her heart, some new evil had crept into it, or some old one had never been expelled. As for little Pearl, the earnestness soon passed out of her face. But the child did not see fit to let the matter drop. Two or three times, as her mother and she went homeward, and as often at suppertime, and while Hester was putting her to bed, and once after she seemed to be fairly asleep, Pearl looked up, with mischief gleaming in her black eyes.

                "Mother," said she, "what does the scarlet letter mean?"

                 And the next morning, the first indication the child gave of being awake was by popping up her head from the pillow, and making that other inquiry, which she had so unaccountably connected with her investigations about the scarlet letter-

                 "Mother!- mother!- why does the minister keep his hand over his heart?"

                  "Hold thy tongue, naughty child!" answered her mother, with an asperity that she had never permitted to herself before. "Do not tease me; else I shall shut thee into the dark closet!"  

-The Scarlet Letter By Nathaniel Hawthorne

pgs. 163-164