More quotes by Robert A. Heinlein

"Love is that condition in which the happiness of another person is essential to your own... Jealousy is a disease, love is a healthy condition. The immature mind often mistakes one for the other, or assumes that the greater the love, the greater the jealousy."
"May you live as long as you wish and love as long as you live."
"One man's theology is another man's belly laugh."
"A poet who reads his verse in public may have other nasty habits."
"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."