夜郎自大

yè láng zì dà chéng bù liǎo shì shí

夜郎自大，成不了事实。

Arrogance makes no fact.

zuò jǐng guān tiān yè láng zì dà shì fǎn duì gǎi gé de rén de tōng bìng

坐井观天，夜郎自大，是反对改革的人的通病。

Having limited outlook and being ignorantly boastful are common failings of the people in opposition to the reform.