The necessity which I experience in my individual life I find to be still more invincible in the collective life of humanity. Humanity is not less incurably religious than I am. The cults it has espoused and abandoned have deceived it in vain; in vain has the criticism of savants and philosophers shattered its dogmas and mythologies; in vain has religion left such tracks of blood and fire throughout the annals of humanity; it has survived all change, all revolution, all stages of culture and progress. Cut down a thousand times, the ancient stem has always sent new branches forth. Whence comes this indestructible vitality? What is the cause of the universality and perpetuity of religion? Before entering upon this question it will be necessary to remove a fruitful cause of error with respect to the essence and origin of the religious sense, especially among the peoples of Latin extraction. This cause lies in the very word _religion_. It very badly designates the psychological phenomenon to be studied; it envelops it in accessory and even in alien ideas, which blind and mislead half-educated men. The word comes to us from the least religious of the peoples of the world. It has no synonym or equivalent in the language of the ancient Hebrews, or in that of the Greeks, the Germans, the Celts, or the Hindus, the human families which, in the religious order, have been the most original and the most creative. It was Rome that imposed the word upon us along with her language, her genius, and her institutions.