It hardly need be observed that the rise and prosperity of these institutions must stand or fall by the correctness of the assumption of fixed values and of the monetisation of all products. Proudhon's opponents wished to make out, that in view of this knowledge his sudden arrest and imprisonment in Saint Pelagie, by which he was divested of all responsibility for the liquidation of the company, was not altogether unwished for by him. But this is contradicted by the attempt which was renewed later on to realise the project of the People's Bank. We have, indeed, no cause to suspect Proudhon's good faith in the matter; on the other hand, the supposed originality of this idea of his is all the more open to suspicion, because in all essential particulars it reminds us too closely of the "labour paper money" of Rodbertus that was to be issued by the State after the determination of values, an idea with which Proudhon's economics had many points in common. There is a still greater similarity between Proudhon's projects and the Boards of Trade thought of by Bray ten years before the beginning of the People's Bank; and it is also like John Gray's Central Bank. * * * * * In later years Proudhon not only outwardly, owing either to compulsion or prudence, renounced all immediate realisation of his intentions, but even became convinced and expressed his conviction in his work upon the federative principle (_Du Principe Federatif_, 1852), that ordered anarchy was an ideal, and as such could never be realised, but that nevertheless human society should strive to attain it by means of federative organisations, as he had sketched it in his earlier writings. Even in this period of mental maturity, when removed from political agitation, he remained the sworn enemy and direct opponent of the Communists, and wished to see the great problem of the best arrangement of society solved, not by universal levelling down, but by the general perfection and development of society; not by revolution from which he had gained nothing but disgust and disillusionment, but by evolution. "If ideas will rise up," he used to say, "then even the paving stones would rise up themselves if the Government were so imprudent as to wait for this."