红尘一梦弹指间
[hóng chén yī mèng dàn zhĭ jiān]
It refers to a transient dream of a life full of temptations and distractions. The dream vanishes like snapping one's fingers, signifying the ephemeral nature of desires or the material world. Here, '红尘' implies the mundane, often bustling world filled with human affairs and activities outside spiritual asceticism, which traditional beliefs may see as trivial or fleeting.