A History of Greek Philosophy / THE SCEPTICS AND EPICUREANS

Page 6

In his Physics Epicurus did little more than reproduce the doctrine of Democritus. He starts from the fundamental proposition that ‘nothing can be produced from nothing, nothing can really perish.’ The veritable existences in nature are the Atoms, which are too minute to be discernible by the senses, but which nevertheless have a definite size, and cannot further be divided. They have also a definite weight and form, but no qualities other than these. There is an infinity of empty space; this Epicurus proves on abstract grounds, practically because a limit to space is unthinkable. It follows that there must be an infinite number of the atoms, otherwise they would disperse throughout the infinite void and disappear. There is a limit, however, to the number of varieties among the atoms in respect of form, size, and weight. The existence of the void space is proved by the fact that motion takes place, to which he adds the argument that it necessarily exists also to separate the atoms one from another. So far Epicurus and Democritus are agreed.

To the Democritean doctrine, however, Epicurus made a curious addition, to which he himself is said to have attached much importance. The natural course (he said) for all bodies having weight is downwards in a straight line. It struck Epicurus that this being so, the atoms would all travel for ever in parallel lines, and those ‘clashings and interminglings’ of atoms out of which he conceived all visible forms to be produced, could never occur. He therefore laid it down that the atoms deviated the least little bit from the straight, thus making a world possible. And Epicurus considered that this supposed deviation of the atoms not only made a world possible, but human freedom also. In the deviation, without apparent cause, of the descending atoms, the law of necessity was broken, and there was room on the one hand for man’s free will, on the other, for prayer to the gods, and for hope of their interference on our behalf.

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