There will be no peace in ...

There will be no peace in Europe if the States rebuild themselves on the basis of national sovereignty, with its implications of prestige politics and economic protection... The countries of Europe are not strong enough individually to be able to guarantee prosperity and social development for their peoples. The States of Europe must therefore form a federation or a European entity that would make them into a common economic unit.
 Jean Monnet

Quotes from the same author

People only accept change when they are faced with necessity, and only recognize necessity when a crisis is upon them.
 Jean Monnet