And just as men depend upon A boat for traversing the sea, So does the mental body need The matter-body for occurrence. And as the boat depends upon The men for traversing the sea, So does the matter-body need The mental body for occurrence. Depending each upon the other The boat and men go on the sea. And so do mind and matter both Depend the one upon the other. 'Visuddhimagga' (XVIII, 36)