Recent quotes:

How a Currency Intended to Unite Europe Wound Up Dividing It - The New York Times

The euro was an attempt to advance the economic integration of Europe by having the countries of the eurozone share a common currency. They looked across the Atlantic and they said: “The United States, big economy, very successful, single currency. We should imitate.” But they didn’t have the political integration. They didn’t have the conditions that would make a single currency work. The creation of the euro is the single most important explanation for the extraordinarily poor performance of the eurozone economies since the crisis of 2008.