no one believe it. In May 1919, Eddington's observation of solar eclipse found that the light did bend in the gravitational field. This new experience immediately convinced everyone of Einstein's theory.

Predictability does not confirm a theory. One or two successful predictions may be lucky like a blind cat encounter a dead rat, even many successful predictions do not indicate that a theory can always succeed. Proof of truth is often not accomplished in one go, especially for those important truths and long-term careers that often require constant reflection and verification. No standard tells us how many success can confirm a truth. It depends entirely on people's choices with comparison of different theories.

After an error occurs in the theory, it will not necessarily be immediately overturned, it can often be repaired. But the need for repair means that the theory is unstable. If a theory always changes, it will be hard to convince people. The viewpoint of movement is of course correct, but the idea of static metaphysics cannot be completely denied, because theory must have stability, and it is best to use eternal, universal truth. Even if the theory is not so stable, it should be as stable as possible and should not change every day. When an experimental phenomenon is confirmed in many people's experiments, it is relatively stable and we treat it as truth.

The original meaning of metaphysics refers to abstract theories and was later regarded by Marxism as a static, isolated, one-sided theory that is opposed to dialectics. But this idea of Marxism is wrong because people study abstract theories in order to seek constant things among changes. Therefore, the idea of being static is not a reactionary point of view, but an indispensable point of view required by practice.

Predictability and stability all require time to verify. When the theory is presented, you need some alternative standards to verify immediately. The logically unified theory is the most stable and predictable, so the logically unified