1. If you want to gain an insight, you first need labor, your own labor, your own initiative, and your own practice. ——Dostoyevsky

2. Practice is the truth of thought. ——Chernyshevsky

3. A theory that has not been tested in practice, no matter how beautiful it is, will lose its weight and will not be recognized by others; practice without a weighty theory as a basis is certain. Will fail. ——Mendeleev

4. It is often the case that the person who opens up new paths for science and technology is sometimes not a famous figure in the scientific world, but an unknown figure in the scientific world. Ordinary people, practitioners, work innovators. ——Stalin

5. Science is called science precisely because it does not recognize idols, is not afraid to overturn outdated things, and listens carefully to the voice of practice and experience. ——Stalin

6. Intelligence is the daughter of experiment. ——Leonardo da Vinci

7. Theory is an officer, practice is a soldier. ——Leonardo Da Vinci

8. The greatest misfortune is that theory is divorced from practice. ——Leonardo da Vinci

6. A theory that cannot stand the test of practice is useless or even harmful. —Tao Zhu

7. Theory is turning into practice, theory is energized by practice, revised by practice, and tested by practice. ——Lenin

8. All true knowledge originates from direct experience. ——Mao Zedong

9. Discover truth through practice, and verify and develop truth through practice.

—Mao Zedong