I love this little poem "Overheard in an Orchard" (some people know it as "Said the Robin to the Sparrow"). It was written by Elizabeth Cheney in 1859.
Said the robin to the sparrow,
"I should really like to know
Why these anxious human beings
rush about and worry so."
Said the sparrow to the robin,
"Friend, I think that it must be
That they have no Heavenly Father
Such as cares for you and me."