You can lead a happy life if you recognize that it's limited and completely unpredictable from one moment to the next.

The Pope was more critical of Christianity than Islam during his visit (to Bavaria). He said on several occasions that the secular world influenced by Christianity must face the idea that it may not be as attractive as it once was. The leaders of other faiths might also be well-advised to admonish their own now and then and not always direct their criticism at others.

About three million Muslims live in the country, but we have no relationship to our diverse Muslim society, despite the fact that it's an established part of our larger society. We need to build a stronger foundation for the relationship between Muslims and the state.

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.

The United States lived on borrowed money for too long, inflating its financial sector unnecessarily and neglecting its small and mid-sized industrial companies.

At the moment we are facing a whole collection of difficult to forecast developments from the situation in China and the oil-price crash to the worrying news from some banks in Europe and the US. All of that is linked: Worldwide company debt is high and there is a lot of money in circulation. That is why necessary structural reforms are not being made.

If the Schengen system (of border-free travel) is destroyed, Europe will be seriously endangered politically and economically. That is why we Europeans have to invest billions in Turkey, Libya, Jordan and other countries in the region as quickly as possible everybody as much as they can.