How are Pearl and Hester's souls intertwined (use Hawthorne's exact words; there are many examples)

From the text:

The truth was, that the little Puritans, being of the most intolerant brood that ever lived, had got a vague idea of something outlandish, unearthly, or at variance with ordinary fashions, in the mother and child, and therefore scorned them in their hearts, and not unfrequently reviled them with their tongues. Pearl felt the sentiment, and requited it with the bitterest hatred that can be supposed to rankle in a childish bosom.