内省不疚[nèi xǐng bú jiù]
find no fault in examining one's heart
1. 得志，与民由之；不得志，独行其道。得志时，和百姓一起走正道。不得志的时候，也能独自坚持正确的原则。上一条：内省不疚，夫何忧何惧
When a gentleman is in power, he should not follow the right course together with the people; when he is not in power, he should still stick to his principles.