Why do words always seem to get in the way of what we want to say?

I took a college course in Formal Semantics. On the first day the professor talked about the importance of precision in language. He said we all have ideas, and we use language to get the idea in our own heads into someone else's.

Thankfully we have a voice, and a face and a body... for the things we can't articulate.. or that need to remain unspoken.

Maybe that's what's missing...