The familiar feeling passes through me, the sense that my ability to help people is both vast and limited at the same time. You learn to live with the paradox. If you don’t, obsessing over the limits will keep you from making the most of what you can do. Meanwhile, you keep looking for chances to push the limits back, to do as much as you can for as many as you can, every day. Even on the bad days, there’s always something good you can do.