Thinking vs Talking in mind

Sometimes, I caught me on talking in mind. Sometimes my tongue moves according to it. Sometimes I talk to myself. This feels very fast and hard to control. There also intuition like thinking. For a example, to move a hand we don't have to say to move. Also I can read a book without moving the tongue. (mind talking) This feels very calm. I like to be in this state. When I want start a work, I need to make my mind silent. What is going on here?