- "Ignorance is curable, stupid is forever." – Robert Heinlein
- "You do not get milk by beating the cow." -Professor Bernardo de la Paz
- "Being intelligent is not a felony. But most societies evaluate it as at least a misdemeanor." – Robert Heinlein
- Robert Heinlein, on being human.
- When any government, or any church for that matter, undertakes to say to its subjects, This you may not read, this you must not see, this you are forbidden to know, the end result is tyranny and oppression no matter how holy the motives.- Robert Heinlein