112. Without going beyond our ideas we find contingency and multiplicity. Experience reveals a continual succession of forms within us; these appearances are something; they cannot be a pure nothing, for they must be something, though only appearances. In them we behold a continual transition from not-being to being, and from being to not-being; therefore there is a production of something which is not necessary, since it is, and ceases to be; therefore there is something besides the being which is supposed the only one. This argument is founded on the purely internal phenomena, and, therefore, is valid even against the idealists, against those who take from the external world all reality, and reduce it to mere appearances, to simple phenomena of our mind. These appearances exist at least as appearances; they are then something, they are contingent, they are not therefore necessary being. Therefore besides this being there is something which is not it; therefore the system which asserts the existence of only one being is not sustainable. The idea of a being absolutely independent by reason of its absolute necessity does not exclude the existence of contingent beings; it only shows that the necessary being is the only necessary being, not that it is the only being. 113. Neither does it follow from the idea of necessary being that there cannot be contingent beings, _caused_, and yet subsisting by themselves in the sense that they are not inherent as modifications in others. Not to be caused and not to be inherent are two very distinct things; the first implies the second, but the second does not imply the first. Every being not caused must be free from inherence, because if it is not caused it is necessary, and contains in itself all that is necessary in order not to inhere in another. If necessary, it must be absolutely independent of all others, which it would not be if it needed them as a modification needs a substance. But not every thing which is not inherent is necessarily not caused, for its cause may have made it such that it does not need to be inherent as a modification in another. It would then depend on another as an effect on its cause, but not as an accident on its substance; there would be between them the relation of causality, but not that of substance; things which we have shown in the last chapter to be very distinct. 114. Never will the pantheists be able to prove that because a thing is not a modification it must be not caused; and this is precisely what they must prove in order to carry their system through in triumph. Once prove that whatever subsists in itself is not caused, and you will have proved whatever subsists in itself to be necessary. And as the necessary being must be only one, you will have proved that there is only one substance.