Can I say anything I know? (Should I say what inside?)

Can I say anything I know?, Should I say what inside?

 Can I say anything I know? (Should I say what inside?)

The short and direct answer is: NO

However..

I focus on listening more than speaking:

There are people who speak more than they hear (a person has two ears and one tongue so that he hears more than he speaks). So, it's better not to talk too much.

I read a lot:

So if I talk, I won't say nonsense, or saying words that implicate me.

I do not interfere with what does not concern me:

There is a hadith of Prophet Mohammed: "part of the goodness of one's Islam is leaving what does not concern him".

I punish myself when I make a mistake:

This is a smart idea. I punish myself with charity, for example. And if I go to the councils of friends where I say nonsense, I punish myself by reducing communication with them.

Make sure to be the LAST ONE who speaks:

I train myself for that well...