“It is a stern fact of history that no nation that rushed to the abyss ever turned back. Not ever, in the long history of the world. We are now on the edge of the abyss. Can we, for the first time in history, turn back? It is up to you.”

Source: Défense des Lettres [In Defense of Letters] (1937), p. ix

Variant: When you look into an abyss, the abyss also looks into you.

Speech (1860)

Future Proofing You (2021)

2014, Address to the United Nations (September 2014)

Presidency (1977–1981), The Crisis of Confidence (1979)
Context: We know the strength of America. We are strong. We can regain our unity. We can regain our confidence. We are the heirs of generations who survived threats much more powerful and awesome than those that challenge us now. Our fathers and mothers were strong men and women who shaped a new society during the Great Depression, who fought world wars, and who carved out a new charter of peace for the world.
We ourselves are the same Americans who just 10 years ago put a man on the Moon. We are the generation that dedicated our society to the pursuit of human rights and equality. And we are the generation that will win the war on the energy problem and in that process rebuild the unity and confidence of America.
We are at a turning point in our history. There are two paths to choose. One is a path I've warned about tonight, the path that leads to fragmentation and self- interest. Down that road lies a mistaken idea of freedom, the right to grasp for ourselves some advantage over others. That path would be one of constant conflict between narrow interests ending in chaos and immobility. It is a certain route to failure.
All the traditions of our past, all the lessons of our heritage, all the promises of our future point to another path, the path of common purpose and the restoration of American values. That path leads to true freedom for our Nation and ourselves. We can take the first steps down that path as we begin to solve our energy problem.
Energy will be the immediate test of our ability to unite this Nation, and it can also be the standard around which we rally. On the battlefield of energy we can win for our Nation a new confidence, and we can seize control again of our common destiny.

Source: The Birth of Tragedy (1872), p. 73
Context: We cannot help but see Socrates as the turning-point, the vortex of world history. For if we imagine that the whole incalculable store of energy used in that global tendency had been used not in the service of knowledge but in ways applied to the practical — selfish — goals of individuals and nations, universal wars of destruction and constant migrations of peoples would have enfeebled man's instinctive zest for life to the point where, suicide having become universal, the individual would perhaps feel a vestigial duty as a son to strangle his parents, or as a friend his friend, as the Fiji islanders do: a practical pessimism that could even produce a terrible ethic of genocide through pity, and which is, and always has been, present everywhere in the world where art has not in some form, particularly as religion and science, appeared as a remedy and means of prevention for this breath of pestilence.

As quoted in How We Elect Our Presidents (1952), edited by Donald Day, p. 111
Variants: We'll hold the distinction of being the only Nation in the history of the world that ever went to the poor house in an automobile.
We hold the distinction of being the only nation in the history of the world that went to the poor-house in an automobile.
We hold the distinction of being the only nation that is goin' to the poorhouse in an automobile.
As quoted in ...

Michael White, Patrick Wintour, "Hanley set to carry the can as defiant Major vows to fight on", The Guardian, 6 May 1995.
Public statement following poor showing in local elections, 5 May 1995. Major's mixed metaphor (if your back is to the wall and you turn round, you are then facing the wall) was remarked upon.
1990s, 1995