Sebastian

“I told you that 'juvenile delinquent' is a contradiction in terms. 'Delinquent' means 'failing in duty.' But duty is an adult virtue—indeed a juvenile becomes an adult when, and only when, he acquires a knowledge of duty and embraces it as dearer than the self-love he was born with. There never was, there cannot be a 'juvenile delinquent.' But for every juvenile criminal there are always one or more adult delinquents—people of mature years who either do not know their duty, or who, knowing it, fail.”
― Robert A. Heinlein, Starship Troopers

“Social responsibility above the level of family, or at most of tribe, requires imagination-- devotion, loyalty, all the higher virtues -- which a man must develop himself; if he has them forced down him, he will vomit them out.”
― Robert A. Heinlein, Starship Troopers

“Never attempt to teach a pig to sing; it wastes your time and annoys the pig.”
― Robert Heinlein, Time Enough for Love

“Victory has a thousand fathers, but defeat is an orphan.”
― Merrill R. Chapman, In Search of Stupidity: Over Twenty Years of High Tech Marketing Disasters