> Yes, I think, loneliness can be coped with training our mind and body. It's a skill that could be developed by anyone.
I'm skeptical. Not that it can be developed, but that everyone can develop it to the point of being able to adequately cope with loneliness. From male prisoners today to pioneer wives of the 19th century, it seems pretty clear to me that some kinds of loneliness can be absolutely devastating for a subset of the population, which in turn suggests susceptibility and responses to loneliness behave like many other aspects of the human condition.
I say this as someone who could likely be teleported to another planet for weeks if not years and be okay--other than perhaps losing the ability to speak[1] and maybe being more susceptible to mild depression or illness--so long as I had stuff to do. I'm not anti-social, but I am an introvert, and socializing takes energy and effort; just physically being in the presence of others can be draining. Conversely, I have several friends and family who derive energy from socializing. I don't think I'd ever have the energy to socialize as often and freely. They almost seem to crave it like they crave air or food. This makes me think that there are those on the opposite end of the spectrum for whom the effort required to stay psychologically healthy in the face of loneliness is more than they could ever muster.
Our brains are like our bodies--while they function similarly, capacities can differ, and differ to the point where not all people can be expected to be able to sustain the same loads, even with all the exercise and preparation in the world. To suggest otherwise risks making other people feel inadequate or failures, especially those who need and seek external validation (again, for the most part not me, even though it still feels nice ;)
The suggestions in the article basically amount to Socrates' instruction to "know thyself". Everybody would benefit from that, though it comes easier for some than others.[2] But that's merely a necessary condition (especially for depression), hardly a sufficient one.
[1] After just 2 or 3 days of no talking I often stumble on the first few words out of my mouth. Likewise for listening to people, though that aspect is difficult to put into words.
[1] Sometime you need input, directly or indirectly, from others to better understand yourself. I definitely don't think I'd thrive were I completely alone.
If we does, then it treats us in various ways. And we find that tranquility in ourselves.
Your comment is very relevant to me especially regarding socializing. That too can be practiced :)