I think that those who serve most potently, work on levels of consciousness that have to do with radiating love — maybe God's love... It is important that you have a brain and use it, but that is secondary. The basic premise is that you allow something to come through you. Then you use your intelligence to give your heart's work discipline and logic. But the transformative energy, that which can change events, that heals, that helps, that serves, comes from somewhere deep inside.
It does seem a strange thing to count suffering as joy, yet there's a truth here in that suffering helps to build one's character. Some of the most beautiful people I know are those who have passed through the flames and come out strengthened. If it happens to clay, why shouldn't it happen to us.