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To those who were surprised that the European Union received the Nobel Peace Prize, I say: Think twice. This was not only a deserved award for Europe’s contribution to bringing peace and stabilizing democracies in the recent past. The Nobel Committee was also sending a clear warning to contemporary leaders. I could almost hear them saying: “On this difficult odyssey, don’t abandon ship. In today’s world, the EU is too valuable to squander.”

It was an indirect but powerful rebuttal to the dangerous nationalist and populist rhetoric some politicians have adopted when describing the recent financial crisis.

This message couldn’t have come at a better time.

Like ghosts from the...