Pain often leads to injury. Which makes it a good indicator for when to stop.
Discomfort, on the other hand, is something we can learn to push through.
It’s never comfortable to run a marathon. It’s never comfortable to publish a blog. It’s never comfortable to ship your work when the deadline hits.
Pain and discomfort are not the same thing. We often confuse the two. Learning to push through discomfort helps us get to the places we want to go.