Keep moral integrity like holding a jade in your hand.
It is better to leave a large sum of money to future generations than to accumulate virtue and do good deeds.
Keep clean as jade: keep moral integrity and be as white as jade. It also means taking care of your body.
The origin of idioms can be traced back to Xia Jingqu's Wild Boudoir Exposed Words 14 in Qing Dynasty: "If a son keeps his own jade, how can he get into the mud!"