Robert Anson Heinlein (; July 7, 1907 – May 8, 1988) was an American science-fiction author, aeronautical engineer, and retired Naval officer. Sometimes called the "dean of science fiction writers", he was among the first to emphasize scientific accuracy in his fiction, and was thus a pioneer of the subgenre of hard science fiction. His published works, both fiction and non-fiction, express admiration for competence and emphasize the value of critical thinking. His work continues to have an influence on the science-fiction genre, and on modern culture more generally.
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Intent is not a thought, or an object, or a wish. Intent is what can make a man succeed when his thoughts tell him that he is defeated. It operates in spite of the warrior's indulgence. Intent is what makes him invulnerable. Intent is what sends a shaman through a wall, through space, to infinity.