Anyone in a state of seeking can never be happy. Only those who are constantly finding are fulfilled. And finding is not something that happens to us - it is something we do.
Let us not forget that the reasons for human actions are usually incalculably more complex and diverse than we tend to explain them later, and are seldom clearly manifest.
If we allow terrorism to undermine our freedom of action, we could reverse at least part of the palpable gains achieved by postwar globalization. It is incumbent upon us not to allow that to happen.