In my case, if something seems obvious and true, but I don’t see it reflected outside myself, then I try to manifest it. If I find myself arguing a lot, getting angry and angering others while simply telling the obvious truth, then I suspect whatever idea I’m speaking for would be better expressed in art. My most successful, “original” artworks were all ideas I’d discussed with others ad nauseum (the other parties’ nauseum, since they couldn’t see what I saw and rejected the concepts in conversation). Yet no matter how much others insisted said ideas were stupid, or crazy, or not worth thinking about, the ideas continued to press themselves on me as true. I wouldn’t need to give them a voice if I could hear them outside myself.
Seems like a good basis for what to talk about onstage. If you're constantly arguing for something that seems obvious to you but not to others, bring it to the stage.