A random exercise, if you will.
Let's face it, profanity serves first and foremost as a means to express some of the more honest emotions and emotional states we undergo. This especially applies to anger and sadness, two emotions that profanity was practically tailor-made for. It's no coincidence that many of them are blunt, effectively describing one's annoyance, one's pain, one's fear, and one's occasional overexcited demeanor, all in one or two words. In their way, swears can be very cathartic, allowing a bit of the anger and sadness to come out in a usually not destructive manner. (There's even that tidbit about how swearing can actually kill a little of the physical pains one experiences, although it won't be as effective if you tend to swear a blue streak as it is.) And let's be even more honest. You are an adult. Thus, you deserve to speak like an adult, and be able to express yourself like one as well. How do you accomplish that? It varies, but ultimately, it's a matter of being honest about one's feelings and experiences, even if it's just a wheezy "Fuck..." uttered all alone after running into a wall.
This differs from the previous tenet in its aim. Being "honest" regards the self and its relation to profanity. Being "true" relates more to society as a whole. A good way to explain this is to look at how profanity is used in media, for the most part. Realistically, a lot of dialogue between people will incorporate some degree of cusswords, from the casual uses of "damn" and "hell", to the F-bombs dropped when someone's royally pissed off. I mean, would it sound believable if people used a ridiculous amount of minced oaths, with the goshes and darns and so forth? Hell no. So, in that sense, being true in this context means understanding that others will use it, and others will speak for themselves, and thus sound true to themselves for doing so. Of course, this also requires that one be aware of the cheap, assholish tactics that the shitheads of the world will try, like the jackasses who like to turn everything you say into an insult. But that's to be expected.
That said, like many things in life, there is a time and place for profanity. And, as bad as this might sound to some people, there are times where, despite your honesty and all, you will have to censor what your really think, so that you do not make a potentially bad situation worse. You have to recognize the time and place for profanity, which naturally isn't in certain environments, like an office space, or a formal affair, or anywhere around little kids. In that regard, one must also be savvy about how often they utilize it (of course, that ties into knowing the time and place). And after that, it is necessary to understand the murky areas for profanity usage, such as when slurs get involved, or someone cusses a wee bit too much-basically the line between being a typical person and being a total asshole. In the case of the latter, sure, it's realistic, but after a while, it gets a bit grating to constantly hear swears every three or four words. I mean, it's asinine to assume people who utilize swearwords in their daily speech are idiots with a limited vocabulary. But on the other hand, someone who uses them constantly without any degree of savvy isn't going to fare well either. Language is about expression and communication, in a way that connects people with their experiences. But overdoing it through the misuse of a type of language and not having good judgment about it kinda tends to muck up the works. I guess, in short, if there is a rule to be taken from profanity, it's using the right fucking words at the right fucking times without being a fucking idiot about it.
Goddamn, that felt good.