Even such a simple word, three letters, can have the ability to open a window in your mind when your brain is feeling stuck. Yet. This simple tool is incredibly effective. Try it when your brain is telling you your Thoughts are Facts. They probably aren't.

If we don't direct our brain, it does its job on autopilot.  Which is to protect us.  To always look for ways to survive.  To ferret out danger.  Our power as evolved humans comes from the ability to notice this, and adapt our thoughts.  

Yet.  A simple word with a lot of power.  Ours to use anytime we need it.  And Actors are great with words.