Who said "A poem should be a radiance, moving out from itself."?

This quote is attributed to Seamus Heaney.

A poem should be a radiance, moving out from itself. - Seamus Heaney

"A poem should be a radiance, moving out from itself."

Seamus Heaney Creativity

Poet Irish 1939–2013

"Between my finger and my thumb the squat pen rests; snug as a gun."

"Whatever is given can be taken away."

"The main thing is to get the mood right."

"Happiness, I have discovered, is nearly always a rebound from hard work."

"When life gives you lemons, make something beautiful."

"Creativity knows no bounds."

"Creativity is the expression of the soul."

"I'm making this up as I go."