Pain expands your endurance.
When you’re tested through the fires of pain, what’s forged on the other side is perseverance, endurance. If you’ve never ran more than a couple of hundred yards in your life, it doesn’t matter how much you would want to, your body couldn’t physically run a marathon tomorrow. It simply doesn’t have the endurance built up. If you’re training to run a marathon for the first time, you don’t start out by running a marathon. You run a mile. And then you run three. And then you run five, and so on. Over time, your body builds up the endurance necessary to handle the herculean task of running a full marathon. In the same way, pain expands your endurance and gives you the herculean ability to persevere through even the most difficult of circumstances. There is no easy way to build up endurance. You simply have to endure something. There is a purpose behind your pain.