“His was not a small mind bothered by logic and consistency.”
Robert A. Heinlein book Stranger in a Strange Land
Source: Stranger in a Strange Land
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.

“His was not a small mind bothered by logic and consistency.”
Robert A. Heinlein book Stranger in a Strange Land
Source: Stranger in a Strange Land
“A boy who gets a C- in 'Appreciation of Television' can't be all bad.”
Robert A. Heinlein book Starship Troopers
Source: Starship Troopers
“Certain types of loudmouthism should be a capital offense among decent people.”
Robert A. Heinlein book The Moon Is a Harsh Mistress
Source: The Moon is a Harsh Mistress
“Gratitude is a euphemism for resentment.”
Robert A. Heinlein book Stranger in a Strange Land
Source: Stranger in a Strange Land
“A motion to adjourn is always in order.”
Robert A. Heinlein Time Enough for Love
Source: Time Enough for Love
Robert A. Heinlein book The Moon Is a Harsh Mistress
Source: The Moon is a Harsh Mistress
“I woke up in bed with a man and a cat. The man was a stranger; the cat was not”
Robert A. Heinlein book The Cat Who Walks Through Walls
Source: The Cat Who Walks Through Walls
“The trouble with conspiracies is that they rot internally.”
Robert A. Heinlein book The Moon Is a Harsh Mistress
Source: The Moon is a Harsh Mistress
“As it says in the Bible, God fights on the side with the heaviest artillery.”
Robert A. Heinlein book The Moon Is a Harsh Mistress
Source: The Moon is a Harsh Mistress
“Anyone who considers protocol unimportant has never dealt with a cat.”
Robert A. Heinlein book The Cat Who Walks Through Walls
The Cat Who Walks Through Walls (1985)
“Seems to be a deep instinct in human beings for making everything compulsory that isn't forbidden.”
Robert A. Heinlein book The Moon Is a Harsh Mistress
Source: The Moon is a Harsh Mistress
“A Paradox May Be Paradoctored.”
Robert A. Heinlein book "—All You Zombies—"
"—All You Zombies—" (1958)
Variant: A Paradox May Be Paradoctored.
Robert A. Heinlein book I Will Fear No Evil
Source: I Will Fear No Evil (1970), Chapter 2, p. 35
In a live interview with Walter Cronkite of CBS News, on the day of the first moonwalk (20 July 1969)
Robert A. Heinlein: In Dialogue With His Century, Volume I (1907–1949): Learning Curve (2010)
Robert A. Heinlein book Space Cadet
Source: Space Cadet (1948), Chapter 15 “Pie With a Fork”, p. 180
“Gravity’s books have got to balance.”
Robert A. Heinlein book Farmer in the Sky
Source: Farmer in the Sky (1950), Chapter 17, “Disaster” (p. 177)
Robert A. Heinlein book Space Cadet
Source: Space Cadet (1948), Chapter 16 “P.R.S. Astarte”, p. 195
“Don’t pay any attention to what she says. Half of it’s always wrong and she doesn’t mean the rest.”
The Menace from Earth (p. 351)
Short fiction, The Past Through Tomorrow (1967)
Robert A. Heinlein book Beyond This Horizon
Source: Beyond This Horizon (1948; originally serialized in 1942), Chapter 7, “Burn him down at once—”, p. 75
“Son, suppose you tend to your knitting and I tend to mine.”
Robert A. Heinlein book Double Star
Double Star (1956)
“Nobody ever wins a lawsuit but the lawyers.”
Source: The Door Into Summer (1957), Chapter 2
“I think the major problem in growing up is to become sophisticated without becoming cynical.”
Robert A. Heinlein book I Will Fear No Evil
Source: I Will Fear No Evil (1970), Chapter 27, p. 473
“My old man claimed that the more complicated the law the more opportunity for scoundrels.”
Source: The Door Into Summer (1957), Chapter 5
“Never worry about theory as long as the machinery does what it's supposed to do.”
Waldo & Magic, Inc. (1950)
Robert A. Heinlein book The Number of the Beast
Source: The Number of the Beast (1980), Chapter V : “—a wedding ring is not a ring in my nose—”, p. 41
Robert A. Heinlein Time Enough for Love
Source: Time Enough for Love: the lives of Lazarus Long; a novel , (1973), p. 366
Source: The Door Into Summer (1957), Chapter 8
“He considered horoscopes as silly as spectacles on a cow.”
Robert A. Heinlein book Between Planets
Source: Between Planets (1951), Chapter 4, “The Glory Road” (p. 43)
Robert A. Heinlein book The Cat Who Walks Through Walls
Source: The Cat Who Walks Through Walls (1985), p. 564
“Never listen to newscasts. Saves wear and tear on the nervous system.”
Robert A. Heinlein book Red Planet
Source: Red Planet (1949), Chapter 2, “South Colony, Mars”, p. 17
“Everybody has a skeleton in the closet; the thing is to keep ’em there and not at the feast.”
Robert A. Heinlein book Starman Jones
Source: Starman Jones (1953), Chapter 10, “Garson’s Planet” (p. 109)
“Like searching at midnight in a dark cellar for a black cat that isn’t there.”
Robert A. Heinlein book Starman Jones
Source: Starman Jones (1953), Chapter 11, “Through the Cargo Hatch” (p. 115)
Robert A. Heinlein book Between Planets
Source: Between Planets (1951), Chapter 6, “The Sign in the Sky” (p. 74) - Speech given before the destruction of the nuclear-armed satellite Circum-Terra.
Robert A. Heinlein book The Number of the Beast
Source: The Number of the Beast (1980), Chapter IX : Most males have an unhealthy tendency to obey laws., p. 82