From Cao Xueqin
曹雪芹's 《
红楼梦》 (Qing), the couplet over the gate of the Land of Illusion
太虚幻境: ‘
假作真时真亦假,
无为有处有还无。’ (When falsehood is taken for truth, truth becomes falsehood; where nothing is treated as something, something becomes nothing.) A philosophical motif that runs through the entire novel.