In this passage from "The Grey King" by Susan Cooper, a character expresses a profound truth about humanity. They describe how humans are unique in their tendency to take from one another, highlighting the cruelty that exists within human nature. This includes the taking of life and liberty, driven by greed or ignorance, emphasizing that such actions stem from individual choice. The speaker warns Bran Davies about the dangers posed by his own kind, suggesting that while the world is filled with various creatures, it is primarily humanity that can inflict harm.

The sentiment presented captures a deep sadness and vulnerability that resonates with the human experience. It serves as a stark reminder of the darker aspects of our nature, urging caution and awareness of the potential for harm that exists within interpersonal relationships. The idea that humans are their own worst enemies invites reflection on moral choices and the responsibilities we hold towards one another, underscoring the necessity for compassion in a world where betrayal can often come from those closest to us.