The medieval symbol is a way of approaching the divine, but it is not the epiphany of something numinous, nor does it reveal to us a truth that can be articulated solely in terms of myth and not in terms of rational discourse. Rather, it is the preamble to a rational discourse, and its duty is to make clear, at the point when it seems didactically useful and appropriate to its role as preamble, its own inadequacy, its own (almost Hegelian) destiny to become real by a subsequent rational discourse.
[Umberto Eco, On Literature, McLaughlin, tr., Harcourt (Orlando, FL: 2004) p. 147.]
