The two sentences that create a hopeful mood are:
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"For a while, as they walked, they seemed to carry in them a measure of contentment; some of the serenity and the cleanliness of that big warm kitchen lingered on inside them." (paragraph 32)
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"She told them about Frederick Douglass, the most famous of the escaped slaves, of his eloquence, of his magnificent appearance." (paragraph 36)
These sentences convey a sense of peace and inspiration, suggesting a positive outlook amidst struggles.