Samuel P. Huntington (1993), 'The Clash of Civilizations?', Foreign Affairs, 72, pp.22-49.

We are facing a mood and a movement far transcending the level of issues and policies and the governments that pursue them. This is no less than a clash of civilizations-the perhaps irrational but surely historic reaction of an ancient rival against our Judeo-Christian heritage, our secular present, and the worldwide expansion ofboth.2