The best poem is that whose worked-upon unmagical passages come closest, in texture and intensity, to those moments of magical accident.

-Thomas, Dylan Marlais
  Quite Early One Morning,'On Poetry'.

It isn't what he says that counts as a work of art, it's what he makes with such intensity of perception that it lives with an intrinsic movement of its very own to verify the authenticity.

-Williams,William Carlos
Of the poet. Quoted by Richard Eberhart in the NewYorkTimes, 17 Dec1950.

Turning and turning in the widening gyre The falcon cannot hear the falconer; Things fall apart; the centre cannot hold; Mere anarchy is loosed upon the world, The blood-dimmed tide is loosed, and everywhere The ceremony of innocence is drowned; The best lack all conviction, while the worst Are full of passionate intensity. SeeAchebe 2:18.

-Yeats,W(illiam) B(utler)
  'The Second Coming', l.1^8. Collected in Michael Robartes and the Dancer (1921).