Voltaire,
Voltaire's Philosophical Dictionary
“ Has anyone ever been able to divine how he acts, how he wakes, how he sleeps? Does anyone know how his limbs obey his will? has anyone discovered by what art ideas are marked out in his brain and issue from it at his command? Frail automatons moved by the invisible hand which directs us on this stage of the world, which of us has been able to detect the wire which guides us?We dare question whether the soul is "spirit" or "matter"; if it is created before us, if it issues from non-existence at our birth, if after animating us for one day on earth, it lives after us into eternity. ”
