The red light and the green light

I have two intimate friends:
The red light
      And
The green light.

The red light warns me
   And cautions me
      And finally commands,
         “Stop!”

The green light inspires me
   And encourages me
      And finally whispers,
         “Start!”

My red friend
   Teaches me patience.
My green friend
   Teaches me dynamism.

My red friend tells me
   My life is precious.
My green friend tells me
   My goal is precious.

My red friend
   Perfects my will.
My green friend
   Fulfils my dream.