this is a very broad question. what do you mean by pain? do you mean mental pain, physical pain, another third sinister option? i guess i'll answer to how i personally interpret the question.
there is no life without pain. everybody experiences misery at some point in their lives. to say that someone can live without pain is simply untrue. nobody is perfect or happy all the time. life is pain, and pain is life. pain doesn't necessarily have to be a bad thing. it helps up grow, it helps us learn how to persevere or know when to quit. pain signals to someone that something is wrong. you should use that signal, not ignore it.