闭门思过 (bì mén sī guò) | Meaning: shut oneself up and ponder over one's mistakes | Chinese Idiom with Pinyin & Origin

self-introspection · examine oneself by self-reflection反躬自省fǎn gōng zì xǐng

to reflect upon oneself · to examine one's conscience · to question oneself · to search one's soul反省fǎn xǐng

examine one's own conscience in the stillness (or silence) of the night清夜扪心qīng yè mén xīn

to seek the cause in oneself rather than sb else反求诸己fǎn qiú zhū jǐ

shut oneself up and ponder over one's mistakes