I think it's particularly disheartening when you realise that you can't remember not having the voice in your head ! I have only just really accepted that depression is part of who I am, and has been for a long time, and it has been marshalled and fuelled by me, telling myself I should be this, or that - Wherever the voice came from in the first place, it is mine now - recognising how subversive and unhelpful that voice is and knowing I have a choice to listen to it or not, or acknowledge it and counter it with something that is positive is an important step - and not a part of a negative spiral that forms part of the daily trap - and I suppose is how CBT works