1999, initiated by a professor from the College of Arts and Sciences, Cambridge University, UK, was awarded as "the first thinker in the Millennium". As a result, Marx ranked first, while Einstein, who was recognized as the first in habit, ranked second. Marx became the first thinker in the Millennium because Marxism still has strong vitality all over the world. With the disintegration of the Soviet Union, drastic changes in Eastern Europe and serious setbacks in world socialism, this selection result undoubtedly shows that Marxism has convincing scientific value. However, in recent years, some people, especially some intellectuals, worship the West and only pay attention to the western theory of serving a few people, and only pay attention to the old and abstract theory of western society, ignoring the vitality of Marxism that is developing now. Marx had an unshakable belief in his life, that is, to work for the happiness of most human beings. Marx established this belief at the age of 17. Marx wrote a paper entitled "Youth's Consideration in Choosing a Career" when he was 17 years old, saying: If we choose a career that can best work for mankind, then this burden cannot overwhelm us, because it is a sacrifice for everyone; At that time, we didn't enjoy poverty, limitation and selfishness. Our happiness will belong to millions of people, and our cause will exist silently, but it will always play a role. In the face of our ashes, noble people will cry. Marx did this with all his life's efforts and became our model. Marx left a lot of precious wealth to mankind. Among all his works, the most influential and concerned works are the Declaration of * * * and Capital. There is no royal road to science, and only those who do not dread the fatiguing climb along steep mountain roads can hope to reach its glorious summit. Marx's famous saying: ● People can only achieve their own perfection by working hard for the perfection of their contemporaries and their happiness. Life is like an ocean. Only a strong-willed person can reach the other shore. ● People's value lies in their ability. ● Everything is difficult at the beginning, and so is every science. ● All savings are, in the final analysis, time savings.