Source: The Human Side of Enterprise (1960), p. 220 (in 2006 edition)
“There are risks which are not acceptable: the destruction of humanity is one of them.”
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Friedrich Dürrenmatt 19
Swiss author and dramatist 1921–1990Related quotes

Sigmund Freud, "The Future of an Illusion" (1927), ch. 8, from The Complete Psychological Works of Sigmund Freud, ed. James Strachey and Anna Freud (London, Hogarth Press, 1961), vol. 21, p. 44
Misattributed

2000s, 2003, Columbia space shuttle disaster (February 2003)

“If the world does not change course, we risk self-destruction.”
Saving Ourselves From Self-Destruction (2004)
Context: Nuclear proliferation is on the rise. Equipment, material and training were once largely inaccessible. Today, however, there is a sophisticated worldwide network that can deliver systems for producing material usable in weapons. The demand clearly exists: countries remain interested in the illicit acquisition of weapons of mass destruction.
If we sit idly by, this trend will continue. Countries that perceive themselves to be vulnerable can be expected to try to redress that vulnerability — and in some cases they will pursue clandestine weapons programs. The supply network will grow, making it easier to acquire nuclear weapon expertise and materials. Eventually, inevitably, terrorists will gain access to such materials and technology, if not actual weapons.
If the world does not change course, we risk self-destruction.

The Faith that Heals (1910)
Context: Faith is indeed one of the miracles of human nature which science is as ready to accept as it is to study its marvellous effects. When we realise what a vast asset it has been in history, the part which it has played in the healing art seems insignificant, and yet there is no department of knowledge more favourable to an impartial study of its effects, and this brings me to my subject — the faith that heals.
Source: The Poker Face of Wall Street (2006), Chapter 3, Finance Basics, p. 67

1960s, The Quest for Peace and Justice (1964)