天花乱坠

Origin and story

The Mahayana Sutra of Contemplation of the Mind-Ground (大乘本生心地觀經), volume 1, depicts heavenly beings making offerings while the Buddha rests in meditation. Flowers fill the sky; the verse uses 天華亂墜, with 華 meaning flowers. In a separate tradition recorded in Song collections, the monk Yunguang’s preaching is said to have brought down a rain of blossoms.

These are religious imagery and a sermon legend, not independently documented weather events. Together they explain the association with speech that impresses and captivates. Later secular use often turns the praise into skepticism: someone speaks brilliantly but exaggerates or promises more than reality supports. The common modern spelling replaces 華 with 花.