Readers who are familiar with Hegelian logic will at once perceive the difference between Croce's and Hegel's treatment of logical distinctions. There is no attempt on the part of Croce to apply to them the dialectic process, which pervades the whole of Hegel's philosophy, and which is retained by Croce only in its legitimate sphere which is not that of distinctions but of oppositions. The dialectic process, of which the remote ancestor is Plato, and the more immediate forbears those Renaissance philosophers, Cusanus and Bruno, who more or less obscurely affirmed the _principium coincidentiæ oppositorum_, only with Hegel reaches its rigorous logical expression. The most famous instance of its application is to be found in Hegel's formula of the opposition of being and non-being, and of their unity in the becoming: the pure being is identical with the pure non-being, or, to say the same thing in different words, we cannot think the one without the other, and we do actually think the one and the other when we think the actual reality, which is neither being nor non-being, but becoming. Being and non-being are a true couple of opposites, as ideal and real, positive and negative, value and non-value, activity and passivity, and so on. By the application of the dialectic process, all these couples are shown to be not couples of concepts, but single concepts, each couple containing the affirmation and the negation of a single concept. Croce's criticism of Hegel is founded on an interpretation of the dialectic process as logically valid for such couples only, and inapplicable to the distinctions of the concept, or to empirical and abstract concepts; and this criticism, while emphasizing the importance of Hegel's main contribution to philosophical thought, sweeps away at one stroke all that in his philosophy has generally been considered as most distinctly Hegelian both by his followers and by his adversaries.