Well, first of all, from the perspective of Duke Zhou, dreaming of robbing a tomb is a sign of making a fortune, which means that something may be gained in reality. Secondly, you stole the tomb of Confucius and got a piece of jade, which shows that you may have a good understanding of some knowledge and wisdom of Confucius in reality, and you will learn the essence of some traditional cultures, which will benefit your life a lot.
Of course, this is just my personal understanding.