Scarlet Letter D.J. # 43 - Chapter 20: Part 3.

"Before Mr. Dimmesdale reached home, his inner man gave him other evidences of a revolution in the sphere of thought and feeling. In truth, nothing short of a total change of dynasty and moral code, in that interior kingdom, was adequate to account for the impulses now communicated to the unfortunate and startled minister. At every step he was incited to do some strange, wild, wicked thing or other, with a sense that it would be at once involuntary and intentional; in spite of himself, yet growing out of a profounder self than that which opposed the impulse. For instance, he met one of his own deacons. The good old man addressed him with the paternal affection and patriarchal privilege, which his venerable age, his upright and holy character, and his station in the Church, entitled him to use; and, conjoined with this, the deep, almost worshipping respect, which the minister’s professional and private claims alike demanded. Never was there a more beautiful example of how the majesty of age and wisdom may comport with the obeisance and respect enjoined upon it, as from a lower social rank and inferior order of endowment, towards a higher. Now, during a conversation of some two or three moments between the Reverend Mr. Dimmesdale and this excellent and hoary-bearded deacon, it was only by the most careful self-control that the former could refrain from uttering certain blasphemous suggestions that rose into his mind, respecting the communion-supper. He absolutely trembled and turned pale as ashes, lest his tongue should wag itself, in utterance of these horrible matters, and plead his own consent for so doing, without his having fairly given it. And, even with this terror in his heart, he could hardly avoid laughing to imagine how the sanctified old patriarchal deacon would have been petrified by his minister’s impiety!" (pg. 189 3rd paragraph)
He was in the forest so long that 'natural' impulses started wanting to take over his actions. Pearl, and her wildness started to affect him. He left the forest different, because he started to feel free, he felt more capable of being able to express himself. "The minister’s own will, and Hester’s will, and the fate that grew between them, had wrought this transformation." (pg. 189 2nd paragraph)