Now there were six water pots of stone set there after the Jews' manner of purifying, containing two or three metretes{2 to 3 metretes is about 20 to 30 U. S. Gallons, 16 to 25 imperial gallons, or 75 to 115 litres.} apiece.

 It is the presence of the living, risen Christ which makes the whole world into the Temple of God. So John says that when they remembered, they saw in this a promise of the Resurrection. They did not see that at the time; they could not; it was only their own experience of the living Christ which one day showed them the true depth of what Jesus said. 