Robert Louis Stevenson, author of Treasure Island, wrote a little book entitled A Child's Garden of Verses. One of them (in its entirety) is:
Happy Thoughts
The world is so full of a number of things,
I'm sure we should all be as happy as kings.
A (little-known) satirist named Morris Bishop wrote:
The world is so full of a number of things,
I'm sure we should all be as happy as kings,
And we all know how happy kings are.