What is the theme of "The Truly Great" poem by Stephen Spender? What are two literary devices that contribute to the theme?

The main
theme of the poem centers on the necessity of remembering, celebrating, and cherishing the
"truly great" among us. The narrator doesn't specifically state who these "truly
great" people are, but they might be famous writers and poets the narrator knows.

The narrator praises these "truly great" individuals with highly laudatory
words. During his life, Stephen Spender was infatuated with the idea of fame and greatness. He
yearned for success and dreamed about it; as a rule, he thoroughly enjoyed being surrounded by
successful writers, authors, and poets. It's no surprise, then, that he lavishes high praise on
the "truly great."

He likens these individuals to essentially
superior beings, born from divinity:

What is precious,
is never to forget

The essential delight of the blood drawn from ageless
springs

Breaking through rocks in worlds before our earth

Here, the "blood" of the "truly great" is of
divine origin. It is "drawn from ageless springs," meaning God himself has infused his
divine essence into the bloodstreams of the "truly great." So, "ageless
springs" are adescribing God or Providence, whose power is ageless and eternal. This
"ageless spring" is formidable enough to break through "rocks in worlds before
our earth." Essentially, the narrator may be intimating that the "truly great"
have charted new territory in areas beyond the average citizen's comprehension. Because of this,
we should remember them with deep gratitude and strive to emulate their wisdom and nobility of
spirit.

Besides using metaphors to reinforce his points, Spender also uses
synecdoche to warn
us against letting our busy lives crowd out what's truly important:

Never to allow gradually the traffic to smother

With noise and
fog, the flowering of the spirit.

In the above, Spender
mentions the "traffic" that smothers "the flowering of the spirit." Traffic
is part and parcel of bustling, modern lifestyles. Traffic, along with grueling work schedules
and demanding familial responsibilities, often robs us of time to contemplate the achievements
of the "truly great" and emulate them.

href="https://www.theguardian.com/books/2004/jun/12/featuresreviews.guardianreview16">https://www.theguardian.com/books/2004/jun/12/featuresrev...