Qīng xīn shěng shì means to have a peaceful mind and save time on political affairs.
Pure your mind and have few desires, qīng xīn guǎ yù to clear away distracting thoughts, keep your mind quiet or keep your mind pure, and have fewer desires
According to the Master's decree, I ask you to keep your mind and few desires, observe the precepts and fast, Don't let anyone's heart beat. ——"Selected Songs of the Yuan Dynasty·Nin Zi Ji"
Pure your heart and have fewer desires, qīng xīn shǎo yù means to keep your heart pure and have fewer desires.
"Book of Wei·Biography of Zhang Gun": "﹝ Zhang Baize﹞traveled to Yongzhou to serve as governor, with a pure heart.