1. Therefore, when Heaven is about to entrust this person with a great responsibility, he must first strain his mind, strain his muscles and bones, starve his body and skin, deplete his body, and mess up his actions, so his heart and mind are tempted. Gain what it cannot. ——Meng Ke's "Mencius"

2. The peak of the sword comes from grinding, and the fragrance of plum blossoms comes from the bitter cold.

3. Don’t wait and see. The white head of a young man will make you sad.

——Yue Fei