Who are the real idealists--the idealists not of abstraction, but of life, not of heaven, but of earth--and who are the materialists? It is evident that the essential condition of theoretical or divine idealism is the sacrifice of logic, of human reason, the renunciation of science. We see, further, that in defending the doctrines of idealism one finds himself enlisted perforce in the ranks of the oppressors and exploiters of the masses. These are two great reasons which, it would seem, should be sufficient to drive every great mind, every great heart, from idealism. How does it happen that our illustrious contemporary idealists, who certainly lack neither mind, nor heart, nor good will, and who have devoted their entire existence to the service of humanity--how does it happen that they persist in remaining among the representatives of a doctrine henceforth condemned and dishonored? They must be influenced by a very powerful motive. It cannot be logic or science, since logic and science have pronounced their verdict against the idealistic doctrine. No more can it be personal interests, since these men are infinitely above everything of that sort. It must, then, be a powerful moral motive. Which? There can be but one. These illustrious men think, no doubt, that idealistic theories or beliefs are essentially necessary to the moral dignity and grandeur of man, and that materialistic theories, on the contrary, reduce him to the level of the beasts. And if the truth were just the opposite! Every development, I have said, implies the negation of its point of departure. The basis or point of departure, according to the materialistic school, being material, the negation must be necessarily ideal. Starting from the totality of the real world, or from what is abstractly called matter, it logically arrives at the real idealization--that is, at the humanization, at the full and complete emancipation--of society. _Per contra_ and for the same reason, the basis and point of departure of the idealistic school being ideal, it arrives necessarily at the materialization of society, at the organization of a brutal despotism and an iniquitous and ignoble exploitation, under the form of Church and State. The historical development of man according to the materialistic school, is a progressive ascension; in the idealistic system it can be nothing but a continuous fall.