At every point in human evolution, accepting some form of discomfort was essential to the long term survival of the human species. Who was it, I can recall recently reading or listening to someone saying imagine if our ancestors had gotten so wonderstruck at a flower or something spending hours just looking at beautiful stuff that they hadn't gone hunting or might have gotten hunted. Going hunting was uncomfortable, but we did and survived.
I believe, it also sort of got ingrained in our mind, that we think if we are experiencing some sort of discomfort, we are doing something right, which essentially not needs to be the case. It can be anything.
But I think what of it remains relevant today is about asking yourself some hard questions. It is very uncomfortable, but it's essential. It's very easy and all the more tempting in this age, to not really stop yourself and ask, why are you really doing that? What is it that you believe in? What is it that you stand for? Does it all matter? What matters and what doesn't? On what premises are we going to decide that? What's really going on?
Historically, what we did was to not think about them but go looking for someone who'd tell us the answers. Since we didn't do the thinking, we didn't know whether they were right or wrong. What we do now, is to just shrug these answers away. Just like that. Without even asking anybody.
There is a cost to both kinds of laziness - physical and mental. And we can't get away with either of them. That is, if we want to survive.