“Jealousy is a disease, love is a healthy condition. The immature mind often mistakes one for the other, or assumes that the greater the love, the greater the jealousy - in fact, they are almost incompatible; one emotion hardly leaves room for the other.”

American science fiction author, engineer, and naval officer

Robert A. Heinlein was an American science fiction author, engineer, and naval officer. He is known as a major figure in twentieth-century science fiction, and is sometimes called the “dean of science fiction writers.” He was among the first writers to stress scientific accuracy in fiction, helping shape hard science fiction. His fiction and nonfiction often praise competence, encourage critical thinking, and place characters in situations that test conventional social values. His influence remains visible in the genre and in wider culture.