We find numerous examples of this in Spinoza, whose method indeed it is to prove from conceptions. See, for example, the miserable sophisms in his “Ethics,” P. iv., prop. 29-31, by means of the ambiguity of the uncertain conceptions _convenire_ and _commune habere_. Yet this does not prevent the neo-Spinozists of our own day from taking all that he has said for gospel. Of these the Hegelians, of whom there are actually still a few, are specially amusing on account of their traditional reverence for his principle, _omnis determinatio est negatio_, at which, according to the charlatan spirit of the school, they put on a face as if it was able to unhinge the world; whereas it is of no use at all, for even the simplest can see for himself that if I limit anything by determinations, I thereby exclude and thus negate what lies beyond these limits. Thus in all mere reasonings of the above kind it becomes very apparent what errors that algebra with mere conceptions, uncontrolled by perception, is exposed to, and that therefore perception is for our intellect what the firm ground upon which it stands is for our body: if we forsake perception everything is _instabilis tellus, innabilis unda_. The reader will pardon the fulness of these expositions and examples on account of their instructiveness. I have sought by means of them to bring forward and support the difference, indeed the opposition, between perceptive and abstract or reflected knowledge, which has hitherto been too little regarded, and the establishment of which is a fundamental characteristic of my philosophy. For many phenomena of our mental life are only explicable through this distinction. The connecting link between these two such different kinds of knowledge is the _faculty of judgment_, as I have shown in § 14 of the first volume. This faculty is certainly also active in the province of mere abstract knowledge, in which it compares conceptions only with conceptions; therefore every judgment, in the logical sense of the word, is certainly a work of the faculty of judgment, for it always consists in the subsumption of a narrower conception under a wider one. Yet this activity of the faculty of judgment, in which it merely compares conceptions with each other, is a simpler and easier task than when it makes the transition from what is quite particular, the perception, to the essentially general, the conception. For by the analysis of conceptions into their essential predicates it must be possible to decide upon purely logical grounds whether they are capable of being united or not, and for this the mere reason which every one possesses is sufficient. The faculty of judgment is therefore only active here in shortening this process, for he who is gifted with it sees at a glance what others only arrive at through a series of reflections. But its activity in the narrower sense really only appears when what is known through perception, thus the real experience,