expression · to be completely free from all worldly desires and emotional attachments; viewing the material world as an illusion

他看破红尘，觉得四大皆空，从此不再过问世事。

idiom · the Buddhist teaching that the four physical elements (earth, water, fire, and wind) constituting the universe are empty of permanent essence

佛教认为世界由四大构成，而本质却是四大皆空。