Moving parts in rubbing contact require lubrication to avoid excessive wear. Honorifics and formal politeness provide lubrication where people rub together. Often the very young, the untraveled, the naïve, the unsophisticated deplore these formalities as “empty,” “meaningless,” or “dishonest,” and scorn to use them. No matter how “pure” their motives, they thereby throw sand into machinery that does not work too well at best.
NOTE: I would add to this Heinlein list the concept “respect.”
There is no conclusive evidence of life after death. But there is no evidence of any sort against it. Soon enough you will know. So why fret about it?
History does not record anywhere at any time a religion that has any rational basis. Religion is a crutch for people not strong enough to stand up to the unknown without help. But, like dandruff, most people do have a religion and spend time and money on it and seem to derive considerable pleasure from fiddling with it.
One man's theology is another man's belly laugh.
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.
Place your clothes and weapons where you can find them in the dark.
A woman is not property, and husbands who think otherwise are living in a dreamworld.