I think the whole concept of Pain-Religion Link is a bit outdated but not unheard of. While I personally don't see the appeal, Religion should be a personal/ private Experience. If a person decides self-flagellation/ rapid whirling / nippleclamping or whatever they come up next with strengthens their Bond to God, i do my best to respect that. http://en.wikipedia.org/wiki/Opus_Dei#Mortification