Chixe

It would be clearly undesirable for us to have to formulate our thoughts before we issue an immediate warning ("run!") and communication would be dramatically slowed if we were unable to respond, naturally, to people in normal conversation.

On the other hand, this innate ability is often the source of consternation when what we say on the spur of the moment is something we later wish we had either not said, or said differently; it happens to everyone, sometimes, the trick is to remember when.