Direct Quote from The Essay by Hubert L Drafus – “Heidegger on the connection between Nihilism, Art, Technology and Politics” published in the book Cambridge Companion to Heidegger.
“When everything that is material and social has become completely flat and drab, people retreat into their private experiences as the only remaining place to find significance. Heiddeger sees this move to private experience as characteristic of the modern age. Art, Religion, Sex, Education all become varieties of experience when all of our concerns have been reduced to the common denominator of experience we will have reached the age of Nihilism.”
Guignon. C (editor), 1993, the Cambridge Companion to Heidegger, Cambridge University Press.