I'm planning to self-publish a novella, and I considered including an epigraph. The quote is H.P. Lovecraft's "The oldest and strongest emotion of mankind is fear, and the oldest and strongest kind of fear is fear of the unknown."

It looks like the work that quote comes from is in the public domain. Does that mean I can use it as an epigraph without any concerns? (If not, where would I go to get permission for a quote like this?)