self-sufficing speculation--that speculation which draws its material from within. I differ toto coelo from those philosophers who pluck out their eyes that they may see better; for my thought I require the senses, especially sight; I found my ideas on materials which can be appropriated only through the activity of the senses. I do not generate the object from the thought, but the thought from the object; and I hold that alone to be an object which has an existence beyond one's own brain. I am an idealist only in the region of practical philosophy, that is, I do not regard the limits of the past and present as the limits of humanity, of the future; on the contrary, I firmly believe that many things--yes, many things--which with the short-sighted, pusillanimous practical men of to-day, pass for flights of imagination, for ideas never to be realised, for mere chimeras, will to-morrow, i.e., in the next century,--centuries in individual life are days in the life of humanity,--exist in full reality. Briefly, the "Idea" is to me only faith in the historical future, in the triumph of truth and virtue; it has for me only a political and moral significance; for in the sphere of strictly theoretical philosophy, I attach myself, in direct opposition to the Hegelian philosophy, only to realism, to materialism in the sense above indicated. The maxim hitherto adopted by speculative philosophy: All that is mine I carry with me, the old omnia mea mecum porto, I cannot, alas! appropriate. I have many things outside myself, which I cannot convey either in my pocket or my head, but which nevertheless I look upon as belonging to me, not indeed as a mere man--a view not now in question--but as a philosopher. I am nothing but a natural philosopher in the domain of mind; and the natural philosopher can do nothing without instruments, without material means. In this character I have written the present work, which consequently contains nothing else than the principle of a new philosophy verified practically, i.e., in concreto, in application to a special object, but an object which has a universal significance: namely, to religion, in which this principle is exhibited, developed, and thoroughly carried out. This philosophy is essentially distinguished from the systems hitherto prevalent, in that it corresponds to the real, complete nature of man; but for that very reason it is antagonistic to minds perverted and crippled by a superhuman, i.e., anti-human, anti-natural religion and speculation. It does not, as I have already said elsewhere, regard the pen as the only fit organ for the revelation of truth, but the eye and ear, the hand and foot; it does not identify the idea of the fact with the fact itself, so as to reduce real existence to an existence on paper, but it separates the two, and precisely by this separation attains to the fact itself; it recognises as the true thing, not the thing as it is an object of the abstract reason, but as it is an object