Being silent is not a bad thing. Rather than talking excessively or talking that we don't know, it is not necessarily true, and exaggerating, it would be better if we are silent. When someone is more likely silent than talking something, it does not mean that the person does not know anything, or does not care about, but keeping the speech that does not important to say. Maintain (what he says) so as not to harm other people or himself. Especially now that the mouth can be very dangerous. There is the term "Your mouth is your Tiger". What we say can be disastrous for ourselves. So, be careful when you say, let alone doubt what will be said. How good it would be to be quiet and be a good listener.