A leaf

Look at a leaf. 
Observe its vein structure and symmetry.
The mother tree produces hundreds of thousands of these leaves, all the same and all unique.
Just like us humans.
Look at other leaves from other trees and plants.
Veins and symmetry, varied but the same.
The leaf breathes out the oxygen you need to live.
You breathe out the carbon dioxide the leaf needs to live.
The tree’s expanse in the sky is just as deep as its roots.
You will discover that your expanse in the sky is just as deep as the roots of your humanity.
That’s just how life is.