Light and Dark, Dawn and Dusk

This evening, I watched the movie The Seeker about a boy who is to find 6 signs to defeat Darkness.  While the movie clearly defined Light and Dark as 2 separate things, they are really one.  How can one separate light from darkness?  Light becomes dark and dark becomes light, just like day turns into night and night turns onto day.  So light and dark are in all of us.  Which it is is up to us.  Just like people telling me not to worry, to be happy.

Having known that, we also know that seasons come and seasons go.  So day and night are always there.  That is how it is.  But do we all know that night is never totally dark?  It is just the absence of light.  And if we spend enough time in the dark, one can actually see light in the darkness.