Robert A. Heinlein

"I never learned from a man who agreed with me."

"It is a truism that almost any sect, cult, or religion will legislate its creed into law if it acquires the political power to do so."

"Never underestimate the power of human stupidity."

"The difference between science and the fuzzy subjects is that science requires reasoning while those other subjects merely require scholarship."

"When a place gets crowded enough to require ID's, social collapse is not far away. It is time to go elsewhere. The best thing about space travel is that it made it possible to go elsewhere."

"Women and cats will do as they please, and men and dogs should relax and get used to the idea."