According to the version I own, this poem was dated in 1692!
The old St. Paul Church in Baltimore, USA, was supposedly the place where this message was found.
There was a lot of contradictions behind the story of who was the author of these words.
In fact, the poem Desiderata was written in 1929, by Max Weber.
This website contains more info in case you are interested by the story behind the author and the confusion around it:
Take a look the version I own, In Portuguese:
Below you can check the English version:
It does not matter who wrote it. After all, the knowledge is getting spread, and that's what matters.
See you in the future, Pathfinder.