We cannot say that, in the history of philosophy, the thinkers who had the most progressive effect were those who found most to criticize or who were always on hand with so-called practical programs. Things are not that simple. A philosophical doctrine has many sides, and each side may have the most diverse historical effects. Only in exceptional historical periods, such as the French Enlightenment, does philosophy itself become politics. In that period, the word philosophy did not call to mind logic and epistemology so much as attacks on the Church hierarchy and on an inhuman judicial system. The removal of certain preconceptions was virtually equivalent to opening the gates of the new world. Tradition and faith were two of the most powerful bulwarks of the old regime, and the philosophical attacks constituted an immediate historical action. Today, however, it is not a matter of eliminating a creed, for in the totalitarian states, where the noisiest appeal is made to heroism and a lofty Weltanschauung, neither faith nor Weltanshauung rule, but only dull indifference and the apathy of the individual towards destiny and to what comes from above. Today our task is rather to ensure that, in the future, the capacity for theory and for action which derives from theory will never again disappear, even in some coming period of peace when the daily routine may tend to allow the whole problem to be forgotten once more. Our task is continually to struggle, lest mankind become completely disheartened by the frightful happenings of the present, lest man’s belief in a worthy, peaceful and happy direction of society perish from the earth.