Robert A. Heinlein book Time for the Stars
Source: Time for the Stars (1956), Chapter 12, “Tau Ceti” (p. 122)
Robert Anson Heinlein was an American science fiction writer. Often called the "dean of science fiction writers", his sometimes controversial works continue to have an influential effect on the genre, and on modern culture more generally.
Heinlein became one of the first American science fiction writers to break into mainstream magazines such as The Saturday Evening Post in the late 1940s. He was one of the best-selling science fiction novelists for many decades, and he, Isaac Asimov, and Arthur C. Clarke are often considered the "Big Three" of English-language science fiction authors. Among his most notable works are Stranger in a Strange Land, Starship Troopers, which helped create the space marine and mecha archetypes, and the libertarian novel The Moon is a Harsh Mistress.
A writer also of numerous science fiction short stories, Heinlein was one of a group of writers who came to prominence under the editorship of John W. Campbell at his Astounding Science Fiction magazine; however, Heinlein denied that Campbell influenced his writing to any great degree.
Within the framework of his science fiction stories, Heinlein repeatedly addressed certain social themes: the importance of individual liberty and self-reliance, the obligation individuals owe to their societies, the influence of organized religion on culture and government, and the tendency of society to repress nonconformist thought. He also speculated on the influence of space travel on human cultural practices.
Heinlein was named the first Science Fiction Writers Grand Master in 1974. He won Hugo Awards for four of his novels; in addition, fifty years after publication, five of his works were awarded "Retro Hugos"—awards given retrospectively for works that were published before the Hugo Awards came into existence. In his fiction, Heinlein coined terms that have become part of the English language, including "grok", "waldo", and "speculative fiction", as well as popularizing existing terms like "TANSTAAFL", "pay it forward", and "space marine". He also anticipated mechanical computer aided design with "Drafting Dan" and described a modern version of a waterbed in his novel The Door into Summer, though he never patented or built one. In the first chapter of the novel Space Cadet he anticipated the cell-phone, 35 years before Motorola invented the technology. Several of Heinlein's works have been adapted for film and television.

Robert A. Heinlein book Time for the Stars
Source: Time for the Stars (1956), Chapter 12, “Tau Ceti” (p. 122)
Robert A. Heinlein book Time for the Stars
Source: Time for the Stars (1956), Chapter 8, “Relativity” (p. 82)
“Learning isn’t a means to an end; it is an end in itself.”
Robert A. Heinlein book Time for the Stars
Source: Time for the Stars (1956), Chapter 7, “19,900 Ways” (p. 70)
“I decided not to cross any bridges I had burned behind me.”
Robert A. Heinlein book Time for the Stars
Source: Time for the Stars (1956), Chapter 7, “19,900 Ways” (p. 69)
“Parents probably don’t know that they are playing favorites even when they are doing it.”
Robert A. Heinlein book Time for the Stars
Source: Time for the Stars (1956), Chapter 5, “The Party of the Second Part” (p. 54)
“I was confused. I didn’t feel telepathic; I merely felt hungry.”
Robert A. Heinlein book Time for the Stars
Source: Time for the Stars (1956), Chapter 2, “The Natural Logarithm of Two” (p. 24)
“I used to wonder what it was like to be rich. Now I am and it turns out to be mostly headaches.”
Robert A. Heinlein book Citizen of the Galaxy
Source: Citizen of the Galaxy (1957), Chapter 20 (p. 224)
Robert A. Heinlein book Citizen of the Galaxy
Source: Citizen of the Galaxy (1957), Chapter 10 (p. 108)
“Las Vegas is a three-ring circus with a hangover.”
Robert A. Heinlein book Friday
Source: Friday (1982), Chapter 25 (p. 260)
“Self-pity, he said, is the most demoralizing of all vices.”
Robert A. Heinlein book Friday
Source: Friday (1982), Chapter 24 (p. 244)
“Marriages are arranged in heaven but the bills must be paid here on earth.”
Robert A. Heinlein book Friday
Source: Friday (1982), Chapter 6 (p. 49)
Robert A. Heinlein book Friday
Source: Friday (1982), Chapter 4 (p. 37)
“A baby is lots more fun than differential equations.”
Robert A. Heinlein book Podkayne of Mars
Source: Podkayne of Mars (1963), Chapter 10 (p. 127)
Robert A. Heinlein book Podkayne of Mars
Source: Podkayne of Mars (1963), Chapter 5 (p. 50)
“People who are busy and happy don’t write diaries; they are too busy living.”
Robert A. Heinlein book Friday
Source: Friday (1982), Chapter 33 (p. 353)
“I had learned lately that wanting something and being able to pay for it were not the same.”
Robert A. Heinlein book Friday
Source: Friday (1982), Chapter 27 (p. 286)
Robert A. Heinlein book Friday
Source: Friday (1982), Chapter 24 (p. 257)
“Religious = absolute belief without proof.”
Robert A. Heinlein book Friday
Source: Friday (1982), Chapter 18 (p. 181)
“No one knows much about California politics, including California politicians.”
Robert A. Heinlein book Friday
Source: Friday (1982), Chapter 15 (p. 137)
“You’re not a stranger; you’re an old friend we haven’t known very long.”
Robert A. Heinlein book Friday
Source: Friday (1982), Chapter 12 (p. 110)
“Stupid fools look just as good as military geniuses until the fighting starts.”
Robert A. Heinlein book Friday
Source: Friday (1982), Chapter 4 (p. 37)
“Anything that is moral for a group to do is moral for one person to do.”
Robert A. Heinlein book Podkayne of Mars
There must be a flaw in that, since I’ve always been taught that it is wrong to take the law in your own hands. But I can’t find the flaw and it sounds axiomatic, self-evident. Switch it around. If something is wrong for one person to do, can it possibly be made right by having a lot of people (a government) agree to do it together? Even unanimously?
If anything is wrong, it is wrong—and vox populi can’t change it.
Source: Podkayne of Mars (1963), Chapter 13 (p. 169)
Robert A. Heinlein book Podkayne of Mars
Source: Podkayne of Mars (1963), Chapter 10 (p. 125)
“It’s lots better to be miserable than to be bored.”
Robert A. Heinlein book Podkayne of Mars
Source: Podkayne of Mars (1963), Chapter 8 (p. 94)
“Don’t kid yourself, knowing too much is a capital offense. In politics it always has been.”
Robert A. Heinlein book Friday
Source: Friday (1982), Chapter 31 (p. 327)
Context: Don’t kid yourself, Friday; knowing too much is a capital offense. In politics it always has been.
Robert A. Heinlein book Friday
Source: Friday (1982), Chapter 23 (p. 242)
Robert A. Heinlein book Friday
Source: Friday (1982), Chapter 23 (pp. 240-241)
Context: “So far as I have listened, before a revolution can take place, the population must lose faith in both the police and the courts.“ Elementary. Go on. “Well…high taxation is important and so is inflation of the currency and the ratio of the productive to those on the public payroll. But that’s old hat; everybody knows that a country is on the skids when its income and outgo get out of balance and stay that way—even though there are always endless attempts to wish it away by legislation.”
Robert A. Heinlein book Friday
Source: Friday (1982), Chapter 4 (p. 37)
“Good stories are rarely true.”
Robert A. Heinlein book Tunnel in the Sky
Source: Tunnel in the Sky (1955), Chapter 3, "Through the Tunnel"
The Unpleasant Profession of Jonathan Hoag (p. 267)
Short fiction, The Fantasies of Robert A. Heinlein (1999)
The Unpleasant Profession of Jonathan Hoag (p. 261)
Short fiction, The Fantasies of Robert A. Heinlein (1999)
Robert A. Heinlein book Waldo
Waldo (p. 186)
Short fiction, The Fantasies of Robert A. Heinlein (1999)
Robert A. Heinlein book Waldo
Waldo (p. 134)
Short fiction, The Fantasies of Robert A. Heinlein (1999)
“We must make the fee contingent on results.”
“Did you ever hear of anyone in his right mind dealing with a wizard on any other basis?”
Magic, Inc. (p. 21)
Short fiction, The Fantasies of Robert A. Heinlein (1999)
Robert A. Heinlein book Farnham's Freehold
Source: Farnham's Freehold (1964), Chapter 15 (p. 221)
“The concept of change baffled them.”
Robert A. Heinlein book Farnham's Freehold
Source: Farnham's Freehold (1964), Chapter 14 (p. 196)
Robert A. Heinlein book Farnham's Freehold
Source: Farnham's Freehold (1964), Chapter 10 (p. 145)
Robert A. Heinlein book Farnham's Freehold
Source: Farnham's Freehold (1964), Chapter 4 (p. 75)
“No government has yet been able to repeal natural laws, though they keep trying.”
Robert A. Heinlein book Farnham's Freehold
Source: Farnham's Freehold (1964), Chapter 2 (p. 35)