Final answer:
Human souls are compelled to confront and witness the harsh realities of social degradation, poverty, self-realization, and environmental conditions that can lead to a crisis of the human spirit, as depicted in classic and contemporary texts.
Step-by-step explanation:
The experiences that human souls are forced to witness, as Marley suggests, pertain to the various struggles and realities of life that are often overlooked or ignored by those unaffected by them. In the excerpts provided, these experiences include the crushing weight of social degradation, the physical and psychological pain of poverty, the difficulty of attaining education and self-realization, as well as the stark confrontation with material and environmental conditions that can lead to a crisis of the human soul. From Plato's allegory of the cave, where prisoners are confronted with the painful reality of enlightenment, to the descriptions of the struggles faced by former slaves and the working poor, these texts urge a recognition of the harsher truths of human existence.