‘ If perception are distinct existences, they form a whole only by being connected together. But no connexions among distinct existences are ever discover by human understanding. We only feel a connexion or determination of thought, to pass from one object to another. It follows, therefore that the thought alone finds personal identity, when reflecting on the train of past peceptions, that compose a mind, the ideas of them, are felt to be connected together, and naturally introduce each other. ‘

– David Hume