Photographers have a wide variety of lenses to use when taking pictures. They will sometimes use many different lenses to shoot the same thing. This gives different perspectives. This same is true in our lives.
If all you focus on are the obstacles before you, then you will run into those obstacles. Focus on where you can go.
Each of us must understand that our time in this world is so short, that darkening it with useless arguments, jealousy, not forgiving others, discontentment and bad attitudes is not a productive use of time and energy.