This lot means "to be trained in many layers". It encourages the parties involved to have the heart to endure trials. In life, we face many obstacles and encounter many different situations in order to increase our wisdom and improve our spirituality. In the process, we must learn patience. A jade is not a vessel unless it is polished. The more talented one is, the more setbacks and humiliations he or she will experience. From a different perspective, all of this is merely a process, an opportunity to gain more experience than others. The person you hate now may later become the person you appreciate the most. As the saying goes, "unreasonable demands are training." If you endure them for a time, they will surely be of great benefit to you in the future.