A passion, a violent eruption of nationalism has come upon humankind, and that is as damaging to the social life on earth as is materialism for the life of thinking. So, in the same way that humanity is to work itself out of materialism in order to reach freedom and life in the spirit, it must work itself out of all nationalism, in any form, towards universal humanity. Without that, there can be no progress.
Source: Rudolf Steiner – GA 191 – Soziales Verständnis aus geisteswissenschaftlicher Erkenntnis – Dornach, October 23, 1919 (page 191)
Translated by Nesta Carsten-Krüger