Why do you think John Holbrook acts differently now that he did when Kit talked to him on the Dolphin?

John is trying to impress the Reverend..... he is different because he is unsure of himself.

Grudgingly Matthew lifted the heavy Bible and placed it in John Holbrook's hand, and Rachel moved a pewter candlestick nearer to his elbow. John had been respectfully silent all the evening. Indeed, he had had little opportunity to be anything else, and he now seemed pleased out of all proportion at this slight notice from his master. Kit felt suddenly provoked at him. One week in Wethersfield seemed to have changed the dignified young man she had known on shipboard. Tonight he appeared to be a shadow, hanging on every word from this pompous opinionated man. Even now he dared not assert himself but held the Bible uncertainly in his hands and asked, "What would you have me read, sir?"