"Bittersweetness is a tendency to states of longing, poignancy, and sorrow; an acute awareness of passing time; and a curiously piercing joy when beholding beauty. It recognizes that light and dark, birth and death--bitter and sweet--are forever paired. A song in a minor key, an elegiac poem, or even a touching television commercial all can bring us to this sublime, even holy, state of mind--and, ultimately, to greater kinship with our fellow humans. But bittersweetness is not, as we tend to think, just a momentary feeling or event. It's also a way of being, a storied heritage. Our artistic and spiritual traditions--amplified by recent scientific and management research--teach us its power"