All true knowledge originates from direct experience. A thorough study is not as important as knowing it, and knowing it is not as important as practicing it. Theory is turning into practice, theory is energized by practice, revised by practice, and tested by practice. It is a prosperous day to make achievements. To fulfill its historical mission, the proletariat must master the principle of the unity of revolutionary theory and revolutionary practice. Heaven is in good health, and a gentleman strives to constantly strive for self-improvement. The correct way to succeed is hard work and less empty talk. Science is the general and practice is the soldier. A theory that cannot stand the test of practice is useless or even harmful. The way to get things done is to make every minute count. Practice is the truth of thought. The purpose of creating education is to have both hands and brain. The countermeasure of China’s educational revolution is to make the hand and brain alliance. A hundred gold can buy a fine horse, a thousand gold can buy a beauty, ten thousand gold can buy a noble prince, but where can you buy youth? All controversial and unresolved issues in theory are completely resolved by practice in real life. Knowledge is a treasure, but practice is the key to it.