“One of the very few things that I know I believe strongly is that we must learn how to make a better world out of usable pasts rather than dreaming of infinite futures. It’s a very late-Enlightenment view that says that the only way to make a better future is to believe that the future will be better. Smarter people than me used to believe very differently and I think it is time to listen to them once again.”

The Quotable Walt Disney (2001)
Context: To the youngsters of today, I say believe in the future, the world is getting better; there still is plenty of opportunity. Why, would you believe it, when I was a kid I thought it was already too late for me to make good at anything.

Letter to John Adams (1 August 1816)
1810s

"What I Believe" in The Forum 84 (September 1930), p. 139; some of these expressions were also used separately in other Mencken essays.
1930s
Context: I believe that religion, generally speaking, has been a curse to mankind — that its modest and greatly overestimated services on the ethical side have been more than overcome by the damage it has done to clear and honest thinking.
I believe that no discovery of fact, however trivial, can be wholly useless to the race, and that no trumpeting of falsehood, however virtuous in intent, can be anything but vicious.
I believe that all government is evil, in that all government must necessarily make war upon liberty and the democratic form is as bad as any of the other forms.
I believe that the evidence for immortality is no better than the evidence of witches, and deserves no more respect.
I believe in the complete freedom of thought and speech — alike for the humblest man and the mightiest, and in the utmost freedom of conduct that is consistent with living in organized society.
I believe in the capacity of man to conquer his world, and to find out what it is made of, and how it is run.
I believe in the reality of progress.
I —But the whole thing, after all, may be put very simply. I believe that it is better to tell the truth than to lie. I believe that it is better to be free than to be a slave. And I believe that it is better to know than be ignorant.

2016, Remarks on Donald Trump and the 2016 race

"The Right of Things to Come", presentation for the Science Fiction Research Association (1978), as published in Castle of Days (1992)
Nonfiction

quoted in "Doris Lessing on Feminism, Communism and Space Fiction" http://www.nytimes.com/books/99/01/10/specials/lessing-space.html (25 July 1982), Lesley Hazelton, New York Times Book Review

Source: https://www.vanguardngr.com/2021/10/nigeria-61-eie-11-light-hope-power-and-voice-opinion/ Speaking about Nigeria (October 18 2021 )

Time and Individuality (1940)