Answer:
The author highlights the human capacity to feel for others through empathy, and by doing so, creating a connectedness that encourages altruistic behavior.
Step-by-step explanation:
Empathy allows the recognition and understanding of other people´s affliction, compelling people to help.
The author provides an example of him empathizing with a spider as a living creature allowed to exist, to explain that empathy is the source of pure altruism. Altruism born out of empathy is the pure form of altruism because, in it, the only reason to act altruistically is the desire to help someone else.