In his Nobel Prize acceptance speech, William Faulkner asserts that writers whose work focuses on the problems of the human heart in conflict with itself" and issues surrounding "universal truths" can ultimately
lead humanity into moral corruption and decay
O help humanity to not only endure but to prevail
O wash their hands of humanity's collective problems
O achieve for themselves great wealth and success

help humanity to not only endure but to prevail

Explanation:

Faulkner won Nobel Prize in 1949. and gave, what some claim to be, the best acceptance speech in Nobel Prize history.

Given in the aftermath of WWII, in the time if the great nuclear tensions during the Cold War, when people were afraid for their lives, this speech reminds the audience that writing out of fear is wrong and useless.

That's why, the mission of every poet or writer is to write about inner conflicts of a human heart and universal truths, such as love, honor, pity, pride, compassion, sacriface. Literature's purpose is to remind us of these things and give us hope to endure and prevail fear and hard times.