Through technology the world has become smaller; the states of the large peninsula of Europe appear today as close to each other as the cities of each small Mediterranean peninsula appeared in ancient times.
In the needs and experiences of every individual, based on his awareness of manifold of relations, Europe — one could almost say the world — already outlines itself as an element of unity.
It would consequently be a duty of the educated and well-meaning Europeans to at least make the attempt to prevent Europe — on account of its deficient organization as a whole — from suffering the same tragic fate as ancient Greece once did. Should Europe too gradually exhaust itself and thus perish from fratricidal war?
The struggle raging today will likely produce no victor; it will leave probably only the vanquished. Therefore, it seems not only good, but rather bitterly necessary that educated men of all nations marshall their influence such that — whatever the still uncertain end of the war may be — the terms of peace shall not become the wellspring of future wars.
Einstein and Nicolai – Manifesto to the Europeans (1914) (Eutopia)