The extent of universal energy is limited; it is not "infinite": we should beware of such excesses in our concepts! Consequently the number of states, changes, combinations, and evolutions of this energy, although it may be enormous and practically incalculable, is at any rate definite and not unlimited. The time, however, in which this universal energy works its changes is infinite--that is to say, energy remains eternally the same and is eternally active:--at this moment an infinity has already elapsed, that is to say, every possible evolution must already have taken place. Consequently the present process of evolution must be a repetition, as was also the one before it, as will also be the one which will follow. And so on forwards and backwards! Inasmuch as the entire state of all forces continually returns, everything has existed an infinite number of times. 237 Energy remains constant and does not require to be infinite. It is eternally active but it is no longer able eternally to create new forms, it must repeat itself: that is my conclusion. 238 The energy of the universe can only have a given number of possible qualities. 238 The assumption that the universe is an organism contradicts the very essence of the organic. 239 We are 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 them which continually recurs: activity is eternal, the number of the products and states of energy is limited. 239 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. 240 Anything like a static state of energy in general is impossible. If stability were possible it would already have been reached. 241 Physics supposes that energy may be divided up: but every one of its possibilities must first be adjusted to reality. There can therefore be no question of dividing energy into equal parts; in every one of its states it manifests a certain quality, and qualities cannot be subdivided: hence a state of equilibrium in energy is impossible. 241