That you can’t always say what you want to say. That it sometimes takes great effort to say the simplest of phrases, including your own name - or in my case also the name of my wife… That just the anticipation of a phone call is enough exhaustion for one day. That at a restaurant I’ll order what I can say rather than what I want. (Unless I can point to it ;) And that frequently I have to play ‘dumb’ or ‘forgetful’ because I can’t say the word I want to. This is all from someone who is relatively fluent. Yet it plagues every conversation. Then I’d pause and make sure it sunk it.