Answer:
Keeping slaves clearly causes their slaveholders to become power blind and thereby bring inhuman and cruel attitudes towards slaves.
Step-by-step explanation:
This idea is clearly supported by the case of Sophia Auld.
During the beginning of the text, Douglass describes her as "a pious, warm, and tender-hearted woman". She was good and gentle with him, she was even teaching him how to read.
But she soon became as cruel as any slaveholder.
He describes her change as follows: “The fatal poison of irresponsible power was already in her hands, and soon commenced its infernal work. That cheerful eye, under the influence of slavery, soon became red with rage; that voice, made all of sweet accord, changed to one of harsh and horrid discord; and that angelic face gave place to that of a demon. "
This shows how despite being a sweet and understanding person, Sophia became inhuman because of the power of slavery.