What Is the Difference Between Grief and Happiness?

In the wake of a child lost, there's always this other sort of the ruined love or the lost child right underneath what you're doing in your present life. You keep them with you, but you never quite lose the grief. When you don't feel grief all the time, then you feel guilt, because, in some ways, you think maybe that keeps memory alive. And de i'm actually writing about this in my next book, because it is a very strange place to be. Its sort of like living in two lives at one time, sort of standing in this doorway between, like, grief and happiness.