#以太坊十周年 Observe an apple, the part facing you is visible, while the part facing away from you is not; when observing an object, there are parts that can be observed and parts that cannot be observed. "Knowing" and "not knowing", "understanding" and "not understanding", "can do" and "cannot do" are like people and their shadows in the sunlight, they are never separated. We can never fully know or fully understand, and thus we can never fully achieve after "fully knowing" or "fully understanding". "Invisible" does not mean "nonexistent", nor does it mean "ineffective"; therefore, the future cannot be fully predicted, and actions will always involve certain risks.