It is rarely assumed that not wanting to live might be part of wanting to live; or that finding one's life - or as it is usually generalised in such states of mind, finding life itself - unbearable may, in certain circumstances, be the sane option, the utterly realistic view.
[...] [A] capacity to be depressed means being able to recognise something that is true - that development involves loss and separation, that we hurt people we love and need - and have been prepared to bear the grief and guilt. In this sense depression makes us real. It deepens us.
[...] Seen through the prism of depression, sanity is always bound up with self-regard.