I think something greater than compassion or good manners is at work, something beyond the motivation of the strong to help the weak or the wealthy to help the poor. I think it is the invisible power of grace, moving between the open hearts of the giver and the receiver. The action itself, the lifting of a heavy piece of luggage or the drink of water offered to the thirsty man, may be small. But the energy that is channeled through that action is the high-voltage current of grace. It contains the power to renew someone's faith in himself. It even has the power to save a life.

Caroline Myss in Invisible Acts of Power