事实是最有力的证明现实是最残酷的事实
[shì shí shì zuì yŏu lì de zhèng míng xiàn shí shì zuì cán kù de shì shí]
This translates directly as 'Reality Is the Harsh Fact'. The user may use this term as a sort of self-reminder about accepting realities even though they are harsh at times or a statement regarding life's bitter truths.