Marriages are arranged in heaven but the bills must be paid here on earth. - Robert A. Heinlein

“I don’t like cats.”
“Ever lived with a cat? No, I see you haven’t. How can you have the gall not to like something you don’t know anything about? Wait till you’ve lived with a cat, then tell me what you think. Until then...well, who told you you were entitled to an opinion?”
“Huh? Why, everybody is entitled to his own opinion!”
“Nonsense, Bub. Nobody is entitled to an opinion about something he is ignorant of. If the Captain told me how to bake a cake, I would politely suggest that he not stick his nose into my trade...contrariwise, I never tell him how to plan an orbit to Mars.”

In the army it takes an eight-man working party to help a brass hat blow his nose.

Natural selection—the dying out of the poorly equipped—goes on day in and day out, inexorable and automatic. It is as tireless, as inescapable, as entropy.