Saint Levan's Stone and prophosy

Saint Levan's Stone and an ancient cross - By Jim Champion (originally posted to Flickr as St Levan churchyard) [CC-BY-SA-2.0 (www.creativecommons.org/licenses/by-sa/2.0)], via Wikimedia Commons

"On the south side of the church, to the east of the porch, is a rock broken in two, the fissure being full of ferns and wild flowers that grow in it, while tall grass encompasses it. On this rock St. Levan was wont to sit and read and meditate, or listen to the far-off moan of the sea.

He appears to have had a giant's strength, for one day he gave the stone a blow with his fist and split it in two; then, bending over it, he uttered this prophecy:-

"When with panniers astride,
A packhorse can ride
Through St. Levan's Stone,
The world will be done."

The fissure does not seem to have opened much since the saint's day. There is therefore no immediate chance of his prophecy being fulfilled."

Valentine (undated) 

Map - Saint Levan's Stone