What exactly did J.K Rowling mean when she said "After all, to the well-organized mind, death is but the next great adventure."

I know that she's talking about death, but what else did she mean. Because to me, she was saying that death is good, and the only way to have an afterlife is to die, so is that what she means by "the next great adventure"?<br><br>Sorry if this posts been here before. I didn't find it anywhere.