Stones don't cry when they shatter on the ground. The peculiar property of stone-ness means that these inert objects accept the transfer of kinetic energy with a silence that can only be described as stony. The pebbles that come of boulders retain the former properties of the stone--just in smaller pieces, smaller and smaller. At some point, it is said, a stone is no longer a stone. At which point, by definition, it must weep.
And, in doing so, it must gain tears--pain--feeling--soul. So be careful with stones. And be careful with souls. To make stones weep is no hard thing, but to heal a soul requires more than just mortar and brick.