Reliability is the precondition for trust.

For Martin Schulz, the chancellor candidate for the center-left Social Democrats, friendly wishes don't go far enough. He would like to see much more enthusiastic support for Emmanuel Macron than that shown by Chancellor Angela Merkel, whose comments so far have tended to be reserved. As she put it, she doesn't see a need to change her policies because of Macron.

I would caution against fueling cheap populism. First of all, every German who has spent a vacation in Greece knows that the standard of living there isn't higher than it is in Germany. Second, Greece is paying a high price for European assistance.

Greece's debts are all denominated in euros, but it isn't clear who holds how much of those debts. For that reason, the consequences of a national bankruptcy would be incalculable. Greece is just as systemically important as a major bank.

I don't want to interpret the pope's words, especially as I am one of those horrible people who fell away from the Roman church after Martin Luther.

As for the role of France and Germany: French politics is often more self-confident then German politics due to the catastrophe in the first half of the last century. If Berlin and Paris don't agree, then it is difficult to make progress in Europe.

In China, it was always said that a double-digit rate of growth would be dangerous. Now, the country has a growth rate of 6.9 percent and suddenly that is supposed to be a catastrophe for the global economy.