But just here the revolutionary side of Hegel's philosophy was again taken up, and at the same time freed from the idealistic frippery which had in Hegel's hands interfered with its necessary conclusions. The great fundamental thought, namely, that the world is not to be considered as a complexity of ready-made things, but as a complexity made up of processes in which the apparently stable things, no less than the thought pictures in the brain--the idea, cause an unbroken chain of coming into being and passing away, in which, by means of all sorts of seeming accidents, and in spite of all momentary setbacks, there is carried out in the end a progressive development--this great foundation thought has, particularly since the time of Hegel, so dominated the thoughts of the mass of men that, generally speaking, it is now hardly denied. But to acknowledge it in phrases, and to apply it in reality to each particular set of conditions which come up for examination, are two different matters. But if one proceeds steadily in his investigations from this historic point, then a stop is put, once and for all, to the demand for final solutions and for eternal truths; one is firmly conscious of the necessary limitations of all acquired knowledge, of its hypothetical nature, owing to the circumstances under which it has been gained. One cannot be imposed upon any longer by the inflated insubstantial antitheses of the older metaphysics of true and false, good and evil, identical and differentiated, necessary and accidental; one knows that these antitheses have only a relative significance, that that which is recognized as true now, has its concealed and later-developing false side, just as that which is recognized as false, its true side, by virtue of which it can later on prevail as the truth; that so-called necessity is made up of the merely accidental, and that the acknowledged accidental is the form behind which necessity conceals itself and so on.