Depression is the most unpleasant thing I have ever experienced... It is that absence of being able to envisage that you will ever be cheerful again. The absence of hope. That very deadened feeling, which is so very different from feeling sad. Sad hurts but it's a healthy feeling. It is a necessary thing to feel. Depression is very different.
...the evil of it is, that it is a world wrapped up in too much jeweller's cotton and fine wool, and cannot hear the rushing of the larger worlds, and cannot see them as they circle round the sun . It is a deadened world, and its growth is sometimes unhealthy for want of air .