Sango, Kagome and others in “Unfinished Business”

Sango

The court nobles controlled the country at that time. Wars and famine dragged on and on and countless people perished. Demons devoured the dead and the near dead and they were able to grow in great numbers. Many priests and warriors set out to slay them. But only one priestess, known as Midoriko, was able to purify demon souls and render them harmless. She was considered the most powerful human of her time.

Kagome

She could purify and weaken the demons' souls?

Sango

In her world, animals, trees, and even stones were all created though the foul souls.

Miroku

I've come across that philosophy in my readings. The four souls are called as aranitama, kushinitama, niginitama and sakinitama. When they're combined, they become the spirit of one person housed inside the heart. Aranitama is "courage", niginitama is 'friendship", kushinitama is "wisdom", sakinitama is "love."

Inuyasha

Uh, not really, no.

Shippo

This is way too deep for me.