Do not volunteer information! – an advice once shared by my Israeli employer.
Speaking is revealing. Sharing is revealing.
As soon as someone opens their mouth to share, be it advice, opinion, observation or an insight, they are revealing their internal world, their private reality. It is a doorway into their beliefs and values.
Even the questions are great tells – they give access to expectations of the other. Why would a person ask this particular question, not another?! Because it was of topmost importance!
Snap: what was the last thing you told somebody? What was your intent? Did you got what you were after? Why?