What is more important to see or hear

Why is it considered that the eyes use the priority more than the ears. They say that the eyes can not be deceived. And you can say anything, anything. In fact, the truth is not that we are merging or seeing, but in the meaning that is implied or expected. Let me give an example, we meet a man who holds a knife in his hands. There are two options, or he wants to harm us, or he just tolerates the knife. We see and what we do not really know. So with words, we like everything and we hear, but the meaning does not tell us. Therefore, there is no difference in what to believe in ears or words. It is worth to be on the sidelines and use experience in determining the situation. More experience, more correct decisions and definitions.