I have often asked myself whether, given the choice, I would choose to have manic-depressive illness. ... Strangely enough, I think I would choose to have it. It's complicated. Depression is awful beyond words or sounds or images ... So why would I want anything to do with this illness? Because I honestly believe that as a result of it I have felt more things, more deeply; had more experiences, more intensely; ... worn death 'as close as dungarees', appreciated it - and life - more; seen the finest and most terrible in people ... But, normal or manic, I have run faster, thought faster, and loved faster than most I know. And I think much of this is related to my illness - the intensity it gives to things
An Unquiet Mind
If I can't feel, if I can't move, if I can't think, and I can't care, then what conceivable point is there in living?
Kay Redfield Jamison, An Unquiet Mind: A Memoir of Moods and Madness