Nihilism is a reality, difficult to define, but it is before us, and in the manner that it establishes rupture between the human spirit, the truth and the good supposes a threat for the humanity itself. In this paper, the observations of authors like M. Scheler, J. Maritain, H. Arendt, E. Levinas, M. Heidegger and others are studied. After referring to the nihilist pretension of the existence of a formal art without moral content, it collects the diagnostic of W. Kasper, and the calls of attention about the nihilist phenomenon in the encyclical Fides et Ratio of John Paul II, and recently of Benedict XVI. [ABSTRACT FROM AUTHOR]