And undoubtedly this is so. But at the same time, this its determinateness rests in the fact that it is _only_ universal; hence such a principle is always conditioned, and consequently contains within it a destructive dialectic. As against all these dogmatic philosophies, such criticism and idealism not excepted, the sceptical tropes possess the negative capacity of demonstrating that what the former maintain to be the implicit is not really so. For implicitude such as this is a determinate, and cannot resist negativity, its abrogation. To Scepticism is due the honour of having obtained this knowledge of the negative, and of having so definitely thought out the forms of negativity. Scepticism does not operate by bringing forward what is called a difficulty, a possibility of representing the matter otherwise; that would merely indicate some sort of fancy which is contingent as regards this asserted knowledge. Scepticism is not an empiric matter such as this, for it contains a scientific aim, its tropes turn on the Notion, the very essence of determinateness, and are exhaustive as regards the determinate. In these moments Scepticism desires to assert itself, and the Sceptic therein recognizes the fancied greatness of his individuality; these tropes prove a more cultivated dialectic knowledge in the process of argumentation than is found in ordinary logic, the logic of the Stoics, or the canon of Epicurus. These tropes are necessary contradictions into which the understanding falls; even in our time progression into infinitude and pre-supposition (immediate knowledge) are particularly common (_supra_, p. 363).