The document discusses how poison contradicts Darwin's theory of evolution through natural selection. It argues that poison was not something that evolved over time to help ensure survival, but rather was always present. This suggests there is a malicious element to nature from the beginning. It also draws a comparison between poisonous snakes and poisonous humans, saying that just as some snakes are born poisonous, some people are born with a naturally poisonous or malicious nature as well. This helps explain not just criminal acts but also the small acts of malice we see in everyday life.