Pearls will not shine unless polished. Without careful consideration, gemstones will not shine. If jade is not polished, it will not shine. Jade that has not been polished is not valuable. Wheat has to be ground before it can have flour, and jade has to be polished before it can become a tool. Diamonds also need to be polished. A knife sharpened often will be sharp. Young branches bend easily. Ability, like a muscle, must be exercised to grow. Skills are learned from difficulties. No intelligent person would deny the training value of pain and sorrow. If jade is not polished, it will not become a tool; if a person does not learn, he will not understand. The more the jade is rubbed, the more sparkly it becomes. Jade is like stone in the valley and carved like beautiful women. A man is refined on earth, and his sword is sharpened on a stone. People need to be trained, and horses need to be ridden. The strength is great and the courage is great. If the knife is not sharpened, it will rust; if the water is not flowing, it will stink. All good things come soon. The road to bad things is smooth, but the road to success is twists and turns. A sharp knife is nothing but iron if it is not sharpened. When you are young, you need to ponder when you are studying. Don’t regret being taught too much by a strict teacher. Gold cannot be beaten into a weapon, and a sword must be sharpened even when it is dull. A thousand hammers make a sharp weapon, a hundred times of refinement turns it into pure steel. Blow away all the sand to get to the gold. A warrior becomes a warrior through a hundred battles, and an elite soldier is made through hard work. Don't be afraid of gray hair. Out of hardship come clever people. If you bite the root, everything can be done. As long as you work hard enough, an iron pestle can be ground into a needle. As long as you work hard, the milk tea will be cooked naturally. Drops of water can penetrate stones, and plowshares can sharpen needles. The deeper you work, the more results you achieve. Don’t be afraid of a low starting point, but be afraid of not reaching the end. Sugarcane becomes sweeter after frost. The edge of a sword comes from tempering, and the fragrance of plum blossoms comes from the bitter cold. Strict masters produce great disciples, and mastery of art comes from training. Without suffering, there is no joy. A thousand-mile horse cannot run in the courtyard. A pine cannot grow in a flowerpot, and an eagle cannot fly from a birdcage.