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.

We in Europe need to discuss how we can improve the community. That is the correct order.

Emmanuel Macron wants a stronger Europe, just as the chancellor and I do. I was impressed that the new president climbed onto the stage in front of the Louvre to the sound of the European anthem after his election victory. That was a very powerful symbol. It is very clear: Macron is our ally.

I suggested that countries with tighter finances think about such a [fuel] tax. We don't have the time at the moment for months of discussion.

Reliability is the precondition for trust.

If we want to avoid a clash of cultures - and the jury is still out on whether we can - we'll have to make different cultures and religions compatible with the universal nature of human rights and tolerance. But I can promise you this: Anyone who calls me an infidel at the conference will be in for a fight.

If you live beyond your means and have to restructure as a result, you pay a price.