Robert A. Heinlein book The Puppet Masters
Source: The Puppet Masters (1951), Chapter 10 (p. 58)
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 The Puppet Masters
Source: The Puppet Masters (1951), Chapter 10 (p. 58)
Robert A. Heinlein book If This Goes On
If This Goes On— (p. 426)
Short fiction, The Past Through Tomorrow (1967)
Robert A. Heinlein book If This Goes On
If This Goes On— (p. 401)
Short fiction, The Past Through Tomorrow (1967)
Robert A. Heinlein book Sixth Column
Source: Sixth Column (1949; originally serialized in 1941), Chapter 5 (p. 68)
Robert A. Heinlein book Farmer in the Sky
Source: Farmer in the Sky (1950), Chapter 20, “Home” (pp. 218-219)
Robert A. Heinlein book Red Planet
Source: Red Planet (1949), Chapter 10, “We’re Boxed In!”, p. 148
Source: The Door Into Summer (1957), Chapter 5
Robert A. Heinlein book The Number of the Beast
Source: The Number of the Beast (1980), Chapter XXIX : “—we place no faith in princes.”, p. 286
“I expect this to be my last venture in this field; 'tain't worth the grief”
Robert A. Heinlein book Grumbles from the Grave
Response to efforts to censor his first novel, Red Planet
Grumbles from the Grave (1989)
“The less respect an older person deserves the more certain he is to demand it from anyone younger.”
Robert A. Heinlein book Have Space Suit—Will Travel
Source: Have Space Suit—Will Travel (1958), Chapter 10
“I wish they wouldn’t hold mornings so early.”
Robert A. Heinlein book The Number of the Beast
Source: The Number of the Beast (1980), Chapter XVI : “—a maiden knight, eager to break a lance—”, p. 138
Robert A. Heinlein book The Number of the Beast
Source: The Number of the Beast (1980), Chapter XLVIII : L’Envoi or Rev. XXII: 13, p. 486
Robert A. Heinlein book Have Space Suit—Will Travel
“But the job needs you.”
“The need is not mutual.”
Source: Have Space Suit—Will Travel (1958), Chapter 1
“Between being ‘right’ and being kind, I know which way I vote.”
Robert A. Heinlein book I Will Fear No Evil
Source: I Will Fear No Evil (1970), Chapter 24, p. 400
“I’m not raising any kids to be radioactive dust.”
Robert A. Heinlein book Farmer in the Sky
Source: Farmer in the Sky (1950), Chapter 18, “Pioneer Party” (p. 198)
Robert A. Heinlein book The Number of the Beast
Source: The Number of the Beast (1980), Chapter XVI : “—a maiden knight, eager to break a lance—”, p. 134
“You're in bad shape when your emotions force you into acts which you know are foolish.”
Robert A. Heinlein book Have Space Suit—Will Travel
Source: Have Space Suit—Will Travel (1958), Chapter 8
Robert A. Heinlein book The Number of the Beast
Source: The Number of the Beast (1980), Chapter XXXVIII : “—under his vine and under his fig tree; and none shall make them afraid—”, p. 377
“How can you argue with a woman who won't?”
Robert A. Heinlein book The Cat Who Walks Through Walls
Richard Ames; chapter 19, p. 235
The Cat Who Walks Through Walls (1985)
Robert A. Heinlein book I Will Fear No Evil
Source: I Will Fear No Evil (1970), Chapter 25, p. 427
Robert A. Heinlein book Beyond This Horizon
Source: Beyond This Horizon (1948; originally serialized in 1942), Chapter 6, “We don’t speak the same lingo”, pp. 73-74
Robert A. Heinlein book Farmer in the Sky
Source: Farmer in the Sky (1950), Chapter 16, “Line Up” (p. 161)
Robert A. Heinlein book If This Goes On
If This Goes On— (p. 432)
Short fiction, The Past Through Tomorrow (1967)
“You can only grieve so much; after that it’s self pity.”
Robert A. Heinlein book Farmer in the Sky
Source: Farmer in the Sky (1950), Chapter 18, “Pioneer Party” (p. 188)
Robert A. Heinlein book Beyond This Horizon
Source: Beyond This Horizon (1948; originally serialized in 1942), Chapter 15, “Probably a blind alley—”, p. 146
Robert A. Heinlein book Rocket Ship Galileo
Source: Rocket Ship Galileo (1947), Chapter 4, “The Blood of Pioneers”, p. 34
Robert A. Heinlein Time Enough for Love
Time Enough for Love (1973)
Source: The Door Into Summer (1957), Chapter 12
Robert A. Heinlein book Beyond This Horizon
Source: Beyond This Horizon (1948; originally serialized in 1942), Chapter 14, “—and beat him when he sneezes”, p. 132
“A committee is the only known form of life with a hundred bellies and no brain.”
Robert A. Heinlein book Methuselah's Children
Methuselah's Children (1958)
“She sounds like a sensible person.”
Source: The Door Into Summer (1957), Chapter 11
Robert A. Heinlein book The Puppet Masters
Source: The Puppet Masters (1951), Chapter 10 (p. 61)
Robert A. Heinlein book Beyond This Horizon
Source: Beyond This Horizon (1948; originally serialized in 1942), Chapter 14, “—and beat him when he sneezes”, p. 130
Robert A. Heinlein book Between Planets
Source: Between Planets (1951), Chapter 8, “Foxes Have Holes, and Birds of the Air Have Nests—” (p. 91)
“So-called instincts are instructive, Felix. They point to survival values.”
Robert A. Heinlein book Beyond This Horizon
Source: Beyond This Horizon (1948; originally serialized in 1942), Chapter 7, “Burn him down at once—”, p. 76
Robert A. Heinlein book The Number of the Beast
Source: The Number of the Beast (1980), Chapter XXXI : “—the first ghosts ever to search for an obstetrician.”, p. 321
The Pragmatics of Patriotism (1973)
Context: Selfishness is the bedrock on which all moral behavior starts and it can be immoral only when it conflicts with a higher moral imperative. An animal so poor in spirit that he won't even fight on his own behalf is already an evolutionary dead end; the best he can do for his breed is to crawl off and die, and not pass on his defective genes.
Robert A. Heinlein book Farmer in the Sky
Source: Farmer in the Sky (1950), Chapter 18, “Pioneer Party” (p. 196)
Robert A. Heinlein book The Number of the Beast
Source: The Number of the Beast (1980), Chapter XXVI : The Keys to the City, p. 249
Robert A. Heinlein book I Will Fear No Evil
Source: I Will Fear No Evil (1970), Chapter 1, p. 24
“An invention is something that was “impossible” up to then—that’s why governments grant patents.”
Source: The Door Into Summer (1957), Chapter 6
“I am learning that we still have things to learn.”
Robert A. Heinlein book The Number of the Beast
Source: The Number of the Beast (1980), Chapter XIV : “Quit worrying and enjoy the ride.”, p. 128
“I counted to ten slowly, using binary notation.”
Source: The Door Into Summer (1957), Chapter 8
“Every law that was ever written opened up a new way to graft.”
Robert A. Heinlein book Red Planet
Source: Red Planet (1949), Chapter 4, “Lowell Academy”, p. 49
“If at Last You Do Succeed, Never Try Again.”
Robert A. Heinlein book "—All You Zombies—"
"—All You Zombies—" (1958)