“Good poetry is not contained in words that are difficult to understand and interpret. Good poetry is based on its ability to touch and move feelings.”
Related quotes

"The Anonymity of the Regional Poet: Ted Kooser," from Can Poetry Matter? Essays on Poetry and American Culture (1992)
Essays

Demander à la poésie du sentimentalisme…ce n'est pas ça. Des mots rayonnants, des mots de lumière…avec un rythme et une musique, voilà ce que c'est, la poésie.
Remark, June 22, 1863, reported in the Journal des Goncourts (Paris: Bibliothèque-Charpentier, 1888) vol. 2, p. 123, (ellipses in the original); Arnold Hauser (trans. Stanley Godman and Arnold Hauser) The Social History of Art (London: Routledge & Kegan Paul, 1951) vol. 2, p. 684.

Quotes from interviews, Insider Audio interview (1997)
Context: I don't appreciate poetry--I don't mind admitting that now, I don't understand poetry. We studied it in high school and college, but they never told us why it was good. I got A's on all the exams--"Hail to thee blithe spirit, bird thou never wert"-- what the hell does that mean? I have no idea.
1920s
Source: 'Consistent Poetry Art', Schwitters' contribution to 'Magazine G', No. 3, 1924, ed. Hans Richter; as quoted in I is Style, ed. Siegfried Gohr & Gunda Luyken, (commissioned by Rudi Fuchs, director of the Stedelijk Museum Amsterdam), NAI Publishers, Rotterdam 2000, p. 151.
Laura Riding and Robert Graves from "Poetry and Politics", reprinted in The Common Asphodel (London: Hamish Hamilton, 1949)