What message is William Faulker trying to relay to the young writers in his speech "On Receiving the Nobel Prize"?

When Faulkner presented his speech in 1950, much of the
civilized world was involved in the Cold War, and all were living in a nuclear world.
Children regularly participated in bomb/air raid drills in school; people in much of
Europe and the Soviet Union could not travel freely, and most wondered what new conflict
the next day would bring. Because of this stark reality, Faulkner claims that writers
have become too focused on all of these external conflicts and that they no longer write
about universal truths; they had forgotten about "the problems of the human heart in
conflict with itself."

Faulkner uses his Nobel Prize
platform to express the power that writers possess. In his view, they don't simply
remind mankind of its past glories and goodness; rather, they should use the pen to be a
pillar of sorts for man to prop himself up on and endure. Thus, Faulkner wants young
writers to avoid the temptation to write only of the "end of man" or the dark, current
times in which they were living--to avoid being mere recorders.