Answer:
They are two brothers. However much they run, they do not reach each other.
How can you throw a ball as hard as you can, to only have it come back to you, even if it doesnβt bounce off anything?
Small, containing light, You'll need it in the dark, It will provide that spark, and shine into the night. Will light up any pyre, 'Cause it can help make a fire.
What has no hands but might knock on your door, and if it does you better open up?
You speak this when you are being sincere.
What is always coming but never arrives?