I was thinking about the two sides of the coin.  It is related to the scientific fact: Opposite poles attract.  Then came this song on the background.

We never really can experience darkness without the concept of light.  We never can appreciate the value of a person when they are just there.  We are just too comfortable and familiar with each other until we let them go. We shoo them away by our mean words, thoughtless deeds, immature ways.  Then they are gone.

Life is short so let us spread love. We experience pain but let's love anyway and let that mean, immature and thoughtless person we care. We love no matter what.

"Let Her Go"

Well you only need the light when it's burning low
Only miss the sun when it starts to snow
Only know you love her when you let her go

Only know you've been high when you're feeling low
Only hate the road when you’re missin' home
Only know you love her when you let her go
And you let her go

Staring at the bottom of your glass
Hoping one day you'll make a dream last
But dreams come slow and they go so fast

You see her when you close your eyes
Maybe one day you'll understand why
Everything you touch surely dies

But you only need the light when it's burning low
Only miss the sun when it starts to snow
Only know you love her when you let her go

Only know you've been high when you're feeling low
Only hate the road when you're missin' home
Only know you love her when you let her go

Staring at the ceiling in the dark
Same old empty feeling in your heart
'Cause love comes slow and it goes so fast

Well you see her when you fall asleep
But never to touch and never to keep
'Cause you loved her too much
And you dived too deep

Well you only need the light when it's burning low
Only miss the sun when it starts to snow
Only know you love her when you let her go

Only know you've been high when you're feeling low
Only hate the road when you're missin' home
Only know you love her when you let her go

And you let her go (oh, oh, ooh, oh no)
And you let her go (oh, oh, ooh, oh no)
Will you let her go?

'Cause you only need the light when it's burning low
Only miss the sun when it starts to snow
Only know you love her when you let her go

Only know you've been high when you're feeling low
Only hate the road when you're missin' home
Only know you love her when you let her go

'Cause you only need the light when it's burning low
Only miss the sun when it starts to snow
Only know you love her when you let her go

Only know you've been high when you're feeling low
Only hate the road when you're missin' home
Only know you love her when you let her go

And you let her go