The poster of “Desiderata” was a big hit in 1969 dorm rooms. The poem is a credo for life, including the phrases “as far as possible, be on good terms with all persons” and “speak your truth quietly and clearly, and listen to others.”
Similar concepts are stated in the following list from the apostle Paul in 1 Thessalonians 5.14-21:
Admonish the idle
Encourage the fainthearted
Help the weak
Be patient with them all
See that no one repays anyone evil for evil
Always seek to do good to one another and to everyone
Rejoice always
Pray without ceasing
Give thanks in all circumstances
Do not quench the spirit
Do not despise prophecies, but test everything
Hold fast what is good
Abstain from every form of evil.
So why would you value one credo over the other? For a Christian there are at least two major distinctions. First, the Thessalonians list is from the scriptures, written around 50 AD; Desiderata was written in the early twentieth century and copyrighted in 1927.
Second, the Thessalonians passage includes, particularly for “give thanks in all circumstances,” this phrase – “for this is the will of God in Christ Jesus for you.”
So the list from Paul is the Word of God and has the Will of God. It’s hard to beat that.