“[D]epression is less like a tumour and more like a stabbing pain in your abdomen: it’s telling you something, and you need to find out what. (No responsible GP would just pump you with painkillers and send you home.)…We don’t really know our own minds, and we often have powerful motives for keeping things that way. We see life through the lens of our earliest relationships, though we usually don’t realise it…”