I think a tolerance for pain is really a tolerance for the world. Obiouvlsy, certain physical pains are too much to endure without some sort of anesthetic, but regular pains and pitfalls are a test and strengthening of character. I firmly believe that without hurt and there can be no love. Without loss there is no sense of appreciation. To know and fully appreciate what's good, first there has to be a knowledge of evil because according to Saint Augustine, evil is the absense of good.
"By grace, through faith."
very true. Stay strong.