«Just as in religion the spontaneous activity of the human imagination, of the human brain and the human heart, operates on the individual independently of him – that is, operates as an alien, divine or diabolical activity – so is the worker’s activity not his spontaneous activity. It belongs to another; it is the loss of his self.»

– Estranged Labour, in Economic and Philosophical Manuscripts of 1844 by Karl Marx

As heard on Thinking Allowed, https://www.bbc.co.uk/programmes/b0b2kpm0