In addition, here are a few from Heinlein's character Lazarus Long.
"Your enemy is never a villlian in his own eyes. Keep this in mind; it may offer a way to make him your friend. If not, you can kill him without hate--and quickly."
"Of all the strange "crimes" that human beings have legislated out of nothing, "blasphemy" is the most amazing---with "obscenity" and "indecent exposure" fighting it out for the second and third place."
"All societies are based on rules to protect pregnant women and young children. All else is surplusage, excrescence, adornment, luxury, or folly which can, and must, be dumped in emergency to preserve this prime function. As racial survival is the only universal morality, no other basic is possible. Attempts to formulate a "perfect society" on any foundation other than "Women and children first!" is not only witless, it is automatically genocidal. Nevertheless, starry-eyed idealists (all of them male) have tried endlessly---and no doubt will keep on trying."
"When the need arises---and it does---you must be able to shoot your own dog. Don't farm it out---that doesn't make it nicer, it makes it worse."
"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."
"A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects."
"Dear, don't bore him with trivia or burden him with your past mistakes. The happiest way to deal with a man is never tell him anything he does not need to know."
"Whenever women have insisted on absolute equality with men, they have invariably wound up with the dirty end of the stick. What they are and what they can do makes them superior to men, and their proper tactic is to demand special privileges, all the traffic will bear. They should never settle merely for equality. For women, "equality" is a disaster."
"One man's "magic" is another man's engineering. "Super-natural" is a null word."
"To stay young requires unceasing cultivation of the ability to unlearn old falsehoods."
"The profession of shaman has many advantages. It offers high status with a safe livelihood free of work in the dreary, sweaty sense. In most societies it offers legal privileges and immunities not granted to other men. But it is hard to see how a man who has been given a mandate from on High to spread tidings of joy to all mankind can be seriously interested in taking up a collection to pay his salary; it causes one to suspect that the shaman is on the moral level of any other con man.But it's lovely work if you can stomach it."
"Freedom begins when you tell Mrs. Grundy to go fly a kite."
"Political tags---such as royalist, communist, democrat, populist, facist, liberal, conservative, and so forth---are never basic criteria. The human race divides politically into those who want people to be controlled and those who have no such desire. The former are idealists acting from highest motives for the greatest good of the greatest number. The latter are surly curmudgeons, suspicious and lacking in altruism. But they are more comfortable neighbors than the other sort."