Final answer:
The quote from 'My Heart Is Bursting' - "If I had been fighting I would have done it by day and not in the dark", reflects a tone of honesty and integrity, emphasizing the speaker's value of open and transparent actions in conflict.
Step-by-step explanation:
The tone of the sentence from "My Heart Is Bursting" can best be described as conveying a sense of honesty and integrity. The speaker is implying that if they were involved in a conflict or struggle, they would conduct themselves openly and with transparency, preferring daylight for battle over the secrecy and ambiguity of the night. This suggests a tone of sincerity, as the speaker values forthrightness and a direct approach.