Robert A. Heinlein
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As in the work of other authors, in Heinlein's work there is little clear distinction between the themes of his work and the sort of philosophical views that he propagated.
In his book To Sail Beyond the Sunset, Heinlein has the main character, Maureen, state that the purpose of metaphysics is to ask questions: Why are we here? Where are we going after we die? (and so on), and that you are not allowed to answer the questions. Asking the questions is the point for metaphysics, but answering them is not, because once you answer them, you cross the line into religion.
Maureen doesn't state a reason for this; she simply remarks that such questions are "beautiful" but lack answers. The implication seems to be as follows: because (as Heinlein held) deductive reasoning is strictly tautological (i.e. never generates conclusions that were not already presumed in the premises) and because inductive reasoning is always subject to doubt, the only source of reliable "answers" to such questions is direct experience -- which we don't have.
Maureen's son/lover Lazarus Long makes a related remark in Time Enough For Love. In order for us to answer the "big questions" about the universe, Lazarus states at one point, it would be necessary to stand outside the universe. (It is not quite clear why this should be so, but at any rate this is what Lazarus says. The usual warnings about mistaking a character's views for those of the author apply here, of course, but this opinion seems fairly easy to tie into Heinlein's own views as expressed in nonfiction and interviews.)
During the 1930s and 1940s, Heinlein was deeply interested in Count Alfred Korzybski's General Semantics and attended a number of seminars on the subject. His views on epistemology seem to have flowed from that interest, and (some of) his fictional characters continue to express Korzybskian views to the very end of his writing career.
The theme of revolution against corrupt, nasty oppressors infuses several of Heinlein's novels:
The theme of self-making is taken to its furthest in the related books Time Enough for Love, The Number of the Beast, and To Sail Beyond the Sunset. We are invited to wonder, what would humanity be if we shaped customs to our benefit, and not the other way around? How would our humanity be expressed if we did not develop under the soul-squashing influence of culture? We would be individuals. We would have self-made souls.
Other recurring themes binding Heinlein's works together include individual dignity, the value of both personal liberty and responsibility, the virtue of independence, science as a liberating factor, the perniciousness of bureaucrats, the brutality of corporate power, the hypocrisy of organized religion, the objective value of Korzybski's general-semantics and the subjective value of mysticism.
Heinlein originally wrote his first book, Rocket Ship Galileo, because a boy's book was solicited by a major publisher. The publisher rejected it because 'a trip to the moon was preposterous'. He took the manuscript to Scribner's, who bought it - and started a chain of options resulting in a yearly Christmas trade book. This agreement lasted for twelve years, until the editor (who hated science fiction) cut her department's throat by rejecting a manuscript, which Heinlein took across the street and won a Hugo.
The novels that he wrote for a young audience are very different than this "adult" works. He is still the same person, but the themes he takes on in these books have much more to do with the kinds of problems that adolescents experience. His protagonists are usually very intelligent teenagers who have to make a way in the "adult" society they see around them. They are simple tales of adventure, achievement, dealing with dumb teachers and jealous peers. The books "Have Space Suit, Will Travel", "Farmer in the Sky", "The Rolling Stones" are most representative of this type.
However, Heinlein was outspoken with editors and publishers (and other writers) on the notion that juvenile readers were far more sophisticated and able to handle complex or difficult themes better than most people realized. Thus even his juvenile stories often had a maturity to them that make them readable for adults. Indeed, his last "juvenile" novel was Starship Troopers, which is also probably his most controversial work. Starship Troopers was written in response to unilaterally stopping nuclear testing.
Amongst many other awards, he received a Grand Master Nebula of the Science Fiction Writers of America.
Heinlein's fictional works can be found in the library under Library of Congress .E288, or under Dewey 813.54.
Heinlein's philosophy
Struggle for self-determination
The theme of self-making
Juveniles

Bibliography
Early Heinlein Novels
Juvenile Novels
Late Heinlein Novels
"Future History" Short Fiction
Other Short Fiction
Collections
Nonfiction
Spinoffs
Filmography
External links