“Even if surrounded with explanations, Auschwitz can never be grasped.”
As quoted in The Boys' Crusade (2003) by Paul Fussell, pg xv ISBN 0-679-64088-6
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Günter Grass 4
German novelist, poet, playwright, illustrator, graphic art… 1927–2015Related quotes

Source: Attributed from posthumous publications, Dialogues of Alfred North Whitehead (1954), Ch. 21, June 28, 1941.

Preface.
Language and Silence: Essays 1958-1966 (1967)
Context: We come after. We know now that a man can read Goethe or Rilke in the evening, that he can play Bach and Schubert, and go to his day's work at Auschwitz in the morning. To say that he has read them without understanding or that his ear is gross, is cant. In what way does this knowledge bear on literature and society, on the hope, grown almost axiomatic from the time of Plato to that of Matthew Arnold, that culture is a humanizing force, that the energies of spirit are transferable to those of conduct?

Never Born, Never Died (2002)
Context: Tao mystics never talk about God, reincarnation, heaven, hell. No, they don't talk about these things. These are all creations of human mind: explanations for something which can never be explained, explanations for the mystery. In fact, all explanations are against God because explanation de-mystifies existence. Existence is a mystery, and one should accept it as a mystery and not pretend to have any explanation. No, explanation is not needed — only exclamation, a wondering heart, awakened, surprised, feeling the mystery of life each moment. Then, and only then, you know what truth is. And truth liberates.
“Human beings today … are surrounded by huge institutions we can never penetrate”
"Kafka in the Present Day", originally published in [London] Sunday Times (1983)
A User's Guide to the Millennium (1996)
Context: Human beings today … are surrounded by huge institutions we can never penetrate: the City [London's Wall Street], the banking system, political and advertising conglomerates, vast entertainment enterprises. They've made themselves user friendly, but they define the tastes to which we conform. They're rather subtle, subservient tyrants, but no less sinister for that.

1990s, Why "Free Software" is better than "Open Source" (1998)

Patheos, Correspondence with a Creationist http://www.patheos.com/blogs/reasonadvocates/2017/06/06/correspondence-with-a-creationist/ (June 6, 2017)