The people of this world had little profound understanding of the human body or soul. In fact, hardly anyone went out of their way to study such things.
Years of constant warfare had led humans and ninja to focus more on the pursuit of power.
War meant death. With lives so brief, naturally, few people thought about ways to live longer.
Without power, they would die. Life had long since become cheap here.
Although River's words were merely simple theories, not even particularly precise ones, they were like a lighthouse in the night for Orochimaru's research, pointing him toward a course.
The theory of unity between body and soul was more like an overarching framework for his research.
"This is a complex system, Orochimaru."
River smiled, noticing that he had captured the other man's attention.
"Your research into life commands my admiration, Lord Sui. I would love to hear more."
A trace of respect appeared in Orochimaru's eyes as he spoke softly.
He hoped to find more answers, and he deeply admired someone who had gone further down this path than he had.
He knew all too well how difficult it was to reach an accurate conclusion through scientific research, and how many setbacks and failures it required.
"The soul is difficult for ordinary people to understand. You can't see it or touch it. You can't even sense it."
"But the body is something that truly exists!"
River smiled and held out his right hand.
"The limbs, torso, head, internal organs, hair, flesh, and blood-all of these make up the human body."
Orochimaru raised his eyebrows slightly and continued listening.
Every human had these things, and they were commonplace. What could be different about them? They were all fragile in the face of powerful attacks and ninjutsu.
"Don't underestimate the