In this excerpt from Life and Times of Frederick Douglass, what information does Douglass specifically include to develop his argument that slavery is evil?

Poor lady! She did not understand my trouble, and I could not tell her. Could I have made her acquainted with the real state of my mind and given her the reason for it, it might have been well for both of us. /As it was, her abuse fell upon me like the blows of the false prophet upon his a**; she did not know that an angel stood in the way.\ /Nature made us friends, but slavery had made us enemies. My interests were in a direction opposite to hers, and we both had our private thoughts and plans.\ She aimed to keep me ignorant, and I resolved to know, although knowledge only increased my misery. /My feelings were not the result of any marked cruelty in the treatment I received; they sprung from the consideration of my being a slave at all.\ It was slavery, not its mere incidents I hated. I had been cheated./I saw through the attempt to keep me in ignorance.\ I saw that slaveholders would have gladly made me believe that they were merely acting under the authority of God in making a slave of me and in making slaves of others, and I felt to them as to robbers and deceivers.

Answers can be more than one, bracketed with / and \