Nowadays,people don't endure pain long enough to see the impact or the opportunity that lie ahead,we often time Satisfy our present desire not knowing that they is a goal ahead, a basketball coach say they is no gain in practice,but without practice they is no gain, really they is no happiness in pain, but without pain they is no happiness , in my own opinion if it don't cause you , you won't value it , so things that cause you pain to achieve give you reason to secure it the most,but if it those not cause you are pain you won't care to value it. In Essense , the pain you go through to achieved something the more value that thing become. That is to say pain is indirectly proportional to value.
It is about experience - if you don't have negative experiences, positive experiences have no impact either and, if only positive, then the least positive are seen as negatives.