and breaking it, He began

Hearts made of glass are easily shattered. Sometimes that shattering comes upon impact against a solid surface. Other times that impact creates a fissure that only breaks apart upon repeated smaller impacts. Sometimes that shattering is not a singular event but rather the collective action after a slow erosion, pieces of powder rather than shards. But if you imagine that there are hands with a glorious heat that can mold shards into something finer, and if you remember that panes of glass shatter, but solid forms of some depth not so easily, then maybe you revise that statement.

Hearts of glass are easily shattered. Some of them.