A person who remains silent for a long time is often not because they lack ideas, but because past expressions have been repeatedly denied.

Whenever they try to speak up, they are shut down with a phrase like "What do you know," and after experiencing this many times, the brain automatically links "expression" with "risk," ultimately forming a self-protection mechanism—silence.
Therefore, silence is not a personality problem but the result of environmental conditioning.
The key difference lies in whether the environment allows for trial and error.
Some people are encouraged to express themselves as they grow, and even if they guess wrong, they won't be rejected, gradually building a sense of safety in expression and becoming more confident to speak;
While in other environments, mistakes are punished, and only repeating standard answers is safe. Over time, people learn to keep quiet.
This is not a matter of ability but a behavior shaped by different feedback mechanisms.
Therefore, simply attributing "lack of opinion" to the individual and trying to solve it through training in expression skills is a misplacement of priorities.
If someone has been "burned" many times by high-pressure rejection, the problem primarily lies in the environment, not in their courage.
True change often begins in a safe context—if even one person is willing to listen without rushing to deny, they can gradually rebuild their confidence in expression.
In other words, the ability to express oneself is not solely developed through training; it depends on an environment that allows for trial and error and does not treat speaking up as a danger signal.
Once such an environment appears, even if only slightly, silent people will start to gradually find their voice again.