No offense, but considering COVID had just devastated so many people's social lives and caused mental health to be an issue more recognized by society than ever, and not everyone can really relate to this quote (personally I half relate but half disagree ^(1) ) despite trying to self-convince because some people have been there, and for those yet to be there all they have to do is try, and if they're not there they didn't try hard enough… (same logic in italics could also be said of healing-by-prayer: ridiculous except the latter has no success vs the former sees success in a handful of people) and considering social-interaction-is-important-for-mental-health is pretty accepted by the field of psychology, well:

Please don't intentionally isolate yourself for the sake of getting better at tolerating isolation. Humans are (generally) social animals. Be kind to yourself, including doing a favor for your mental health by socializing.

The point of the quote is you should always do your best at taking care of yourself no matter if you're in a relationship or terribly isolated from everyone or anywhere in between; that includes not only making life enjoyable when there's no one around, but also seeking social interactions when you're lonely: make friends, find relatable people online, call your family (if it's not likely to end badly).

Some people get to win competitions "for working really hard" as they say, but apparently that doesn't mean working really hard will guarantee you a win. Okay the example is a bit extreme, but just know people aren't all the same. Some people do succeed in adapting to isolation; others don't. The quote verbatim is probably worth a try, but don't hang your life on it.

Alone or not, you are valid and not inferior; you don't have to live one way or the other; it is your choice, and your options are for you and you alone to explore and determine, and you are rightful to alter your decision at any time.

[^1]: Personally, I'm better at tolerating isolation when I get myself busy doing stuff, but still I need to vent, bad things, good things, to someone, anyone, from time to time.

u/ErikTh3Barbaric thanks for carrying me for my comment-reply visibility. I just think this is very important.