“… humanity is a disease, a cancer on the body of the world.”
Variant: humanity is a cancer on the body of the world
Source: Pretties
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Scott Westerfeld 147
American science fiction writer 1963Related quotes

“Terrorism is metastasizing like cancer in the global body of humanity.”
Counterterrorism and Cybersecurity: Total Information Awareness (2nd Edition), 2015

“There is no greater social evil than religion. It is the cancer in the body of humanity.”
Source: Life, Sex, and Ideas: The Good Life Without God (2002), Chapter 9, “Evil” (p. 34)

“All illegal narcotics are medicinal. Boredom is a disease worse than cancer.”
Drugs cure it, with little or no side effects if used as directed. Life's temporary for a reason, it gets boring after awhile. You should be inventing new drugs is what you should be doing! Newer, crazier drugs... and more holes, that's what you ladies need!
Deadbeat Hero (2004)

Mazurek, Maria (13 May 2016): Komórki rakowe to anarchizujące potwory https://gazetakrakowska.pl/komorki-rakowe-to-anarchizujace-potwory/ar/9985395. Gazeta Krakowska (in Polish), pp. 18–19.

Mazurek, Maria (13 May 2016): Komórki rakowe to anarchizujące potwory https://gazetakrakowska.pl/komorki-rakowe-to-anarchizujace-potwory/ar/9985395. Gazeta Krakowska (in Polish), pp. 18–19.

“Diseases of the mind are more common and more pernicious than diseases of the body.”
Morbi perniciosiores pluresque sunt animi quam corporis.
Book III, Chapter III
Tusculanae Disputationes – Tusculan Disputations (45 BC)