Well that's it: if you don't think, you shouldn't talk!

Don't talk to people you don't want to talk to, and don't talk about stuff you don't want to talk about.

Those who know do not talk And talkers do not know.” — Tao Te Ching

Do not share your thoughts with people who think that what you are thinking is not worth thinking.

Concerning that which cannot be talked about, we should not say anything.

Do you wish people to believe good of you? Don't speak.

Don’t dialogue with someone you can talk to.

Talk that does not end in any kind of action is better suppressed altogether.

Those who speak, do not know; those who know, do not speak.

Those who know do not speak; Those who speak do not know.

Those who know do not speak. Those who speak do not know.

Better to be silent and thought a fool than to speak and remove all doubt.

like the Taoists say, those that know don’t speak, and those who speak, well, they don’t know jack shit.

Don't talk unless you can improve the silence.