I think Pascal was correct because at least those people I know well enough to discuss such matters with tell me they don't spend much time thinking or contemplating about much at all. This is a bit strange to me as I've always thought about things—mind you, not necessarily things of great importance but about things in general. It's dead easy for me to daydream time away (unfortunately). (When I was at school one of the punishments was to be sent to stand in a corner and stare at the wall. It used to send some kids almost crazy but never bothered me much—all I had to do was to go into daydream mode to pass time away!)
Since reading this article it's occurred to me that those people who've really struggled with the isolation of COVID-19 lockdowns and who continually seek the company of other people are perhaps those who suffer this 'inability to sit quietly in a room alone'. I mention this because during earlier posts on the topic of large numbers of people who were not coping with the enforced isolation, I said that for me, if anything, the enforced lockdown was a blessing as I wasn't continually having to deal with people I'd rather not deal with. Similarly, I find noise and activity distracting, even annoying at times.
No doubt when COVID-19 is over and the postmortems begin in earnest, this connection will be researched.
Another afterthought, perhaps those best suited to interplanetary traveling will be those who do have a good ability to quietly contemplate things (after all, it's likely they'll be forced to do lots of it).