There are certain reactions that you aren't allowed to show in Berlin, for example that you feel offended. If you do, the best-case scenario is a sympathetic article along the lines of: Nice guy, but he's not up to it. The alternative is to don a suit of armor and become cynical. But that's not healthy either: Cynicism is the worst characteristic a politician can have. That's why you have to have an internal balance in Berlin, so you can stay true to yourself. And I have that.

You can't always be demanding solidarity from others and then refuse to show it yourself.

Imagine a German as president of the European Commission. If he or she goes to some particular country and says do this or that, it won't be very well received. The president quickly ends up being the evil German. But if the president is elected by and controlled by 700 representatives from all EU countries, that legitimizes him or her in a very different way.

We have to engage in a dialogue with Donald Trump because he is the elected president of the United States of America. But we have to emphatically oppose his foreign policy ideas.

I know people's problems: the problems of those who work hard, who must slave away. The couples who have two incomes but who can nevertheless barely cover their rent. The people who get stuck in traffic on their way to work. The people who have to wait in vain for a train to come just as they are supposed to be picking up their children from daycare. I can say with a clear conscience to those people: I understand your problems. And I will do all I can to decrease them.

In all of my encounters with voters, I have repeatedly been confronted with two points of critique. First: You politicians are all the same! Second: You politicians may be speaking German, but we still don't understand you!

If we want to create new rules of globalization, then we can't just think in terms of the nation state. The nation state has long offered protection. But it suffers from the fact that many citizens increasingly fear that it can no longer protect them: The threat of transnational terrorism is growing. Freedom of movement rules in Europe facilitate social dumping. Regardless of the make-up of the next government, it must have clear ideas on how to overcome the lack of direction of recent years.