The Light at the End of the Tunnel

There's a light at the end of the tunnel that I must go toward.
But no matter how far I go it seems to grow dimmer and dimmer.
The light is just as bright as a rising sun,
But yet as dark as the night sky.
I'm not sure what's wrong with the light,
But I do know that I'll continue to go towards it.
No matter how long it'll take me.