Theme of a Poem

The clouds to the sky.
The trees to the earth a song with a voice.
A poem with a verse.
The wind creates a breeze.
The sun grows a green earth the moon shines on us.
The poem has a theme.
To understand the meaning reach down into the soul.
If you find it there, it's worth more then gold.
If the sky was without stars;
then where would be the night?
If the sun was without light
then where would be the day?
If the head was without a brain
Then we're would be the mind?
If my days are without you, then where am I?