‘Every object that is presented must necessarily be existent. ... Whatever we conceive, we conceive to be existent. Any idea we please to form is the idea of a being; and the idea of a being is any idea we please to form’. [1] But since, according to him, the idea cannot be separated, as Locke supposed it could, from the conditions ‘that determine it to this or that particular existence,’ propositions of the sort which Locke understood by ‘general propositions concerning substances,’ though if they were possible they would ‘concern existence’ as much as any, are simply impossible. Hume, in short, though he identifies the real and nominal essences which Locke had distinguished, yet limits the nominal essence by the same ‘particularity in space and time’ by which Locke had limited the real. [1] p. 370 [Book I, part II., sec. VI.] The question, how the _singular_ proposition is possible, the vital one. 224. A great advance in simplification has been made when the false sort of ‘conceptualism’ has thus been got rid of--that conceptualism which opposes knowing and being under the notion that things, though merely individual in reality, may be known as general. This riddance having been achieved, as it was by Hume, the import of the proposition becomes the central question of philosophy, the answer to which must determine our theory of real existence just as much as of the mind. The issue may be taken on the proposition in its singular no less than in its general form. The weakness of Hume’s opponents, indeed, has lain primarily in their allowing that his doctrine would account for any significant predication whatever, as distinct from exclamations prompted by feelings as they occur. This has been the inch, which once yielded, the full ell of his nominalism has been easily won; just as Locke’s empiricism becomes invincible as soon as it is admitted that qualified things are ‘found in nature’ without any constitutive action of the mind. As the only effective way of dealing with Locke is to ask,--After abstraction of all that he himself admitted to be the creation of thought, what remains to be merely found?--so Hume must be met _in limine_ by the question whether, apart from such ideas of relation as according to his own showing are not simple impressions, so much as the singular proposition is possible. If not, then the singularity of such proposition does not consist in any singleness of presentation to sense; it is not the ‘particularity in time’ of a present feeling; and the exclusion of generality, whether in thoughts or in things, as following from the supposed necessity of such singleness or particularity, is quite groundless. Not relations of resemblance only, but those of quantity also, treated by Hume as feelings.