“The inmost spirit of poetry, in other words, is at bottom, in every recorded case, the voice of pain – and the physical body, so to speak, of poetry, is the treatment by which the poet tries to reconcile that pain with the world.”

Source: The Greek Way (1930), Ch. 11

R. S. Thomas : Priest and Poet, BBC TV (2 April 1972)
Context: Any form of orthodoxy is just not part of a poet's province … A poet must be able to claim … freedom to follow the vision of poetry, the imaginative vision of poetry … And in any case, poetry is religion, religion is poetry. The message of the New Testament is poetry. Christ was a poet, the New Testament is metaphor, the Resurrection is a metaphor; and I feel perfectly within my rights in approaching my whole vocation as priest and preacher as one who is to present poetry; and when I preach poetry I am preaching Christianity, and when one discusses Christianity one is discussing poetry in its imaginative aspects. … My work as a poet has to deal with the presentation of imaginative truth.

Paris Review interview (1958)

Poetry and the World, Ecco Press,1988

From Sublimation of Disobedience (1998)

The Destruction of Troy (1656), Preface.

How to Read a Poem And Fall in Love with Poetry (1998)

Form in Modern Poetry(1932)