Mainly, it's not that there are things you can't say. It's that there are things you can't say without the risk that people who previously lacked a voice might use their own freedom of speech to object.

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

You can't say everything, so you don't say nothing.

When people say that I may not speak, they forget that I may well think. I may think what I want, like everyone else. I shall just refrain from saying everything I think. That might be something many people should do once in a while.

Whereof one cannot speak, thereof one must be silent.

No, never say nothin' without you're compelled tu,
An' then don't say nothin' thet you can be held tu.

Wovon man nicht sprechen kann, darüber muss man schweigen

It is thus quite simply false that whereof one cannot speak (in the sense of 'there is nothing to say about it that specifies it and grants it separating properties'), thereof one must be silent. It must on the contrary be named.

If you must speak ill of another, do not speak it . . .

The point I wish to emphasize is not an economic one, but a human one: if you try to say too many things, you don’t say anything at all.

Let silence be your general rule; or say only what is necessary and in few words.

All well bred persons lie – Besides, you are a woman; you must never speak what you think…

The law of silence: Speak little. Say only what you must. Speak only when necessary. Your oratory should be deeds, not words. You accomplish: let others talk.

I do not say what I do not mean. Neither can anyone force me to say what I don't wish to say.