what’s the theme of this poem?

The Angel’s Cry

I lay on the fresh green grass,
And gazed into the boundless blue sky.
I closed my eyes, cleared my mind,
Inhaled deeply, and let out a sigh.

The bird’s melodic chirps filled me with joy,
As I marvelled at the magnificent flower.
The Sun’s warmth was like a warm blanket,
Protecting me with all its power.

Then I saw an army of clouds,
Charging across the pure blue sky.
I shuddered when their shadows fell upon me,
And the Sun finally said “goodbye”.

The sound of thunder echoed across the field,
So I was going to find a place to hide.
Then a single drop of warm rain struck my face,
Like a tear from an angel that cried.

I lifted my head towards the sky,
And more tears crawled down my face.
I lifted my arms into the air,
As I felt the angel’s warm embrace.

They were sending down tears of joy,
Tears of hope, and tears of love.
When the angel’s tears came to a stop,
They flew away gracefully like a dove.

Then the Sun crawled its way out of the clouds,
And a rainbow arced across the sky.
I will never forget,
The wondrous feeling of the angel’s cry.

so, any ideas about the theme? and how the theme develops?
i wrote it btw
please help!! im having so much trouble with themes!!