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Pearl kissed his lips. A spell was broken. The great scene of grief, in which the wild infant bore a part, had developed all her sympathies; and as her tears fell upon her father's cheek, they were the pledge that she would grow up amid human joy and sorrow, nor for ever do battle with the world, but be a woman in it. Towards her mother, too, Pearl's errand as a messenger of anguish was all fulfilled. (23.10-12; 30-32)
Seeing her father die turns Pearl from a wild "demon-child" determined to "do battle with the world" into a woman—which apparently means having human emotions like joy and sorrow. Aw, our little Pearl is all grown up.