in the southern and northern dynasties(420-589), in the reign1 of king wu of liang, there was a monk2 called * yun guang who was a very accomplished3（有技巧的） preacher. once he explained the sutra（佛经，箴言） so proformdly and subtly that the god of flowers was moved and sent spanine（神圣的） flowers down to earth. soon the land was covered with flowers.
this idiom was later used metaphorically4 to describe talking in a vivid and eloquent5 way(mostly in an exaggerated and impartical manner).
__