noun
self-cleansing power; ability to purify oneself
Used for natural systems (rivers, soil) or metaphorically for personal moral/spiritual purification.
この川は自浄能力が高いので、少しの汚染なら自然にきれいになる。
This river has high self-cleansing power, so it cleans itself naturally from minor pollution.
I believe that humans are endowed with the ability to purify themselves.