What is invisible and powerful?

Answer:  No it’s not gravity, but that is a good guess.  It’s your “thoughts”. Manage your mind because your thoughts control your life. “Be careful how you think; your life is shaped by your thoughts” (Proverbs 4:23 TEV). God is more interested in changing your mind than your circumstances…but He will help you with both.  Guard your heart (mind) my friends.  Actively protect it.  It’s OK to say no for a better yes.