A proverb meaning that pride or prosperity does not last long; originating from classical literature (e.g., The Tale of the Heike).
『平家物語』にもあるように、おごる平家久しからずという言葉が繰り返される。
As in The Tale of the Heike, the phrase 'pride of the Heike does not last long' is repeated.
彼は最近傲慢になっている。おごる平家久しからずだね。
He's been arrogant lately. Pride goes before a fall, you know.