I would sub-title it “living life Stoically”. And it is inspired by Stoicism, that philosophy of contentedness meant for those who would like to get much out of this life without trying too hard, like the Epicureans.
“Desiderata” was written in 1927 by Max Ehrmann (1872-1945). In 1956, the rector of St. Paul’s Church in Baltimore, Maryland, used the poem in a collection of mimeographed inspirational material for his congregation. Someone who subsequently printed it asserted that it was found in Old St. Paul’s Church, dated 1692. The year 1692 was the founding date of the church and has nothing to do with the poem.