from "Lost and Found", by Lucy Cavendish

"Being sad is different from being depressed. Depression is inexplicable, long term and difficult to deal with. It is not necessarily logical. Depression is when you can't see why you should bother to get up in the morning. Depression is when you want to spend all your money, then kill yourself. Depression doesn't make sense and no one can snap you out of it. A cup of tea and a hug don't help."