What evidence does the narrator offer for believing in a past life as a bat?

The narrator of my life as a bat believed in the past life or reincarnation. it believes that it has an impact on the society. The narrator shows her intellect for the human world. Atwood believes that in her past life she was a bat. She considers being a bat is more of a reward than a punishment. Bats can kill without condemnation, but they don't do it out of hate. Whereas human will kill because they hate someone but they sometimes feel condemn or have repentance after.