“A good poem is a contribution to reality. The world is never the same once a good poem has been added to it. A good poem helps to change the shape of the universe, helps to extend everyone's knowledge of himself and the world around him.”
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Dylan Thomas 50
Welsh poet and writer 1914–1953Related quotes
"Answers to Questions," from Mid-Century American Poets, edited by John Ciardi, 1950 [p. 171]
Kipling, Auden & Co: Essays and Reviews 1935-1964 (1980)
“You must believe: a poem is a holy thing — a good poem, that is.”
Poetry and Craft (1965)

General sources
Source: "The Poetry of Amy Lowell" in The Christian Science Monitor (16 May 1925)

“To write good poems is the secret of brevity.”
Simplicity http://www.poetrysoup.com/famous/poem/21390/Simplicity
From the poems written in English

“A perfect poem is impossible. Once it had been written, the world would end.”
The Paris Review, "Writers at Work: 4th series," interview with Peter Buckman and William Fifield (1969).
General sources

Heimsljós (World Light) (1940), Book One: The Revelation of the Deity

“But writing poems and letters doesn't seem to do much good.”
Source: The Unabridged Journals of Sylvia Plath

“It’s a cauld barren blast that blaws nobody good.” - title of poem.”
The Harp of Zion (1853)