Tell me how the author's feelings are expressed and what kind of expression effect is there?

Comparing the dark situation at that time to the night, and comparing the hero who came to save people in the dark situation to the dawn, there are explanations here. {The power of justice will never disappear, and a bright day will come one day} Thoreau (here, Thoreau is compared to "I", or "I" like Thoreau) warned Americans (some heartless people, some people that "I" don't like) to be careful of the people who sleep with me (innocent persecuted people, also referring to "I" for pity and sympathy).

In other words, to be a man without conscience, one good deed deserves another, and one evil deserves another!

Don't be guilty, don't be afraid of ghosts knocking at the door.