Robert Heinlein

“Men are not potatoes!”

“Anybody can look at a pretty girl and see a pretty girl. An artist can look at a pretty girl and see the old woman she will become. A better artist can look at an old woman and see the pretty girl that she used to be. But a great artist-a master-and that is what Auguste Rodin was-can look at an old...”

“Never attempt to teach a pig to sing; it wastes your time and annoys the pig.”

“Goodness without wisdom always accomplishes evil.”

“Anyone who cannot cope with mathematics is not fully human. At best, he is a tolerable subhuman who has learned to wear his shoes, bathe, and not make messes in the house.”