In Anna’s Sewell’s novel Black Beautiful the narrators master is a good and kind man. Which sentence in this excerpt reflects this trait through indirect characterization

in our power to make a world happy - to teach mankind the art of being so - to a character hitherto unknown - and to have, as it were, a new creation intrusted to our hands, are honors that command reflection, and can neither be too highly estimated,

the speaker versus the boy.