Now and again, we find Engels in this work displaying remarkable controversial acumen, as in his discussion of the phrase, "All that is real is reasonable, and all that is reasonable is real" (Alles was wirklich ist, ist vernuenftig, und alles was vernuenftig ist, ist wirklich). From this expression, by the development of the Hegelian argument, he arrives at the conclusion involved in the statement that the value of a social or political phenomenon is its transitoriness, the necessity of its disappearance. Hence the abolition of dogmatic statement and mere subjective reasoning in the realm of philosophy, the destruction of the old school of which Kant was the chief exponent, and the creation of a new school the most advanced teachers of which were, as they still are, the materialistic socialists, of whom Engels and Marx are the chief. The object of this historical sketch is to show the origin of Feuerbach's philosophy as well as of that of Marx and Engels. As the fight between the Young Hegelians and the conservatives grew hotter, the radicals were driven back upon the English-French materialism of the preceding century. This was embarrassing for followers of Hegel, who had been taught to regard the material as the mere expression of the Idea. Feuerbach relieved them from the contradiction. He grasped the question boldly and threw the Hegelian abstraction completely to one side. His book, "Wesen des Christenthums," in which his ideas were set forth, became immediately popular, and an English translation, which was widely read, was made of it by George Eliot under the title of "Essence of Christianity." Engels is by no means grudging of expressions of appreciation with regard to this work, and its effects both upon himself and the educated world in general. This "unendurable debt of honor" paid, however, he proceeds to attack the idealistic humanitarianism which Feuerbach had made the basis and sanction of his ethical theories. Although Feuerbach had arrived at the materialistic conclusion, he expressed himself as unable to accept materialism as a doctrine. He says that as far as the past is concerned he is a materialist, but, for the future, he is not so--"Backward I am in agreement with the materialists, forward not"--a statement which impels Engels to examine the materialism of the eighteenth century, which he finds purely mechanical, without any conception of the universe as a process, and therefore utterly inadequate for the philosophic needs of the period at which Feuerbach wrote; for by that time the advance of science, and the greater powers of generalization, arising from patient experimentation, and the development of the evolutionary theory, had rendered the eighteenth century views evidently absurd.