Shundo David Haye

A monk asked, “What is the intention of coming from the west?” 
The master said, “A single stone in space.”
The monk bowed.
The master said, “Do you understand?”
He said, “I don’t understand.” 
The master said, “I trust you don’t understand. If you understood, I’d [or it would] bust your head.” 

How big do you think the stone is? How big do you think space is?