An unlimited number of new changes and states on the part of limited energy is a contradiction, however extensive one may imagine it to be, and however economical the changes may be, provided it is infinite. We are therefore forced to conclude: (1) either that the universe began its activity at a given moment of time and will end in a similar fashion,—but the beginning of activity is absurd; if a state of equilibrium had been reached it would have persisted to all eternity; (2) Or there is no such thing as an endless number of changes, but a circle consisting of a definite number of them which continually recurs: activity is eternal, the number of the products and states of energy is limited. 7 If all the possible combinations and relations of forces had not already been exhausted, then an infinity would not yet lie behind us. Now since infinite time must be assumed, no fresh possibility can exist and everything must have appeared already, and moreover an infinite number of times. 8 The present world of forces leads back to a state of greatest simplicity in these forces: it likewise leads forwards to such a state,—cannot and must not _both_ states be identical? No incalculable number of states can evolve out of a system of limited forces, that is to say, out of a given quantity of energy which may be precisely measured. Only when we falsely assume that space is unlimited, and that therefore energy gradually becomes dissipated, can the final state be an unproductive and lifeless one. 9 First principles.—The last physical state of energy which we can imagine must necessarily be the first also. The absorption of energy in latent energy must be the cause of the production of the most vital energy. For a highly positive state must follow a negative state Space like matter is a subjective form, time is not. The notion of space first arose from the assumption that space could be empty. But there is no such thing as empty space. Everything is energy. We cannot think of that which moves and that which is moved together, but both these things constitute matter and space. We isolate. 10 Concerning the resurrection of the world.—Out of two negatives, when they are forces, a positive arises. (Darkness comes of light opposed to light, cold arises from warmth opposed to warmth, &c, &c.) 11 An uncertain state of equilibrium occurs just as seldom in nature as two absolutely equal triangles. Consequently anything like a static state of energy in general is impossible. If stability were possible it would already have been reached. 12 Either complete equilibrium must in itself be an impossibility, or the changes of energy introduce themselves in the circular process before that equilibrium which is in itself possible has appeared.—But it would be madness to ascribe a feeling of self-preservation to existence! And the same applies to the conception of a contest of pain and pleasure among atoms. 13