Over a period of 20 years, German reunification has cost 2 trillion euros, or an average of 100 billion euros a year. So, we have to ask ourselves: Aren't we willing to pay a tenth of that over several years for Europe's unity?

There's no more place in the euro zone for well-meaning laxness when dealing with deficits and failings. If the demands on Greece aren't taken seriously, we'll get stuck in quicksand. In the worst case, this would make it acceptable for one tranche to not be paid out. It is in the Greeks own interest not to test that.

You can't let a candidate run for too long. He will be dragged along, cut apart, put back together and ripped to shreds again - from both the political opponents and the media.

If I had political responsibility, I would want to prepare for a plan B that would foresee that the European currency union, that the eurozone, no longer necessarily consists of 17 member states. And that means to make provisions so that other countries are not pulled into the maelstrom through contagion.

Greece will not manage to get back on its feet without restructuring its debt. There is no way around it. The country's creditors will have to reduce a portion of its debts by extending maturity dates, lowering interest rates or giving them what's called a 'haircut' in financial jargon.