God creates the vine and teaches it to draw up water by its roots and, with the aid of the sun, to turn water into a juice which will ferment and take on certain qualities. Thus every year, from Noah’s time till ours, God turns water into wine. That, men fail to see. Either like the Pagans they refer the process to some finite spirit, Bacchus or Dionysus: or else, like the moderns, they attribute real and ultimate causality to the chemical and other material phenomena which are all that our senses can discover in it. But when Christ at Cana makes water into wine, the mask is off. The miracle has only half its effect if it only convinces us that Christ is God: it will have its full effect if whenever we see a vineyard or drink a glass of wine we remember that here works He who sat at a wedding party in Cana.
-C.S. Lewis, Miracles