Why it needs to be 'for everyone'?

Just because I like it and want to share it, here’s another quote from Gilles Deleuze’s essay ‘Desert Islands’. I suppose you might say art where he says literature.

‘The essence of the deserted island is imaginary and not actual, mythological and not geographical. At the same time, its destiny is subject to those human conditions that make mythology possible. Mythology is not simply willed into existence, and the peoples of the earth quickly ensured they would no longer understand their own myths. It is at this very moment literature begins. Literature is the attempt to interpret, in an ingenious way, the myths we no longer understand, at the moment we no longer understand them, since we no longer know how to dream them or reproduce them.’