Robert Heinlein

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

“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 prett...”

“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.”

“A poet who reads his verse in public may have other nasty habits.”

“Men are not potatoes!”