In a Logic suitably reformed on this basis, it will be fitting to proclaim before all things this truth, and to draw from it all its consequences: the logical fact, _the only logical fact_, is _the concept_, the universal, the spirit that forms, and in so far as it forms, the universal. And if be understood by induction, as has sometimes been understood, the formation of universals, and by deduction the verbal development of these, then it is clear that true Logic can be nothing but inductive Logic. But since by the word "deduction" has been more frequently understood the special processes of mathematics, and by the word "induction" those of the natural sciences, it will be advisable to avoid the one and the other denomination, and to say that true Logic is the Logic of the concept. The Logic of the concept, adopting a method which is at once induction and deduction, will adopt neither the one nor the other exclusively, that is, will adopt the (speculative) method, which is intrinsic to it. The concept, the universal, is in itself, abstractly considered, _inexpressible_. No word is proper to it. So true is this, that the logical concept remains always the same, notwithstanding the variation of verbal forms. In respect to the concept, expression is a simple _sign_ or _indication_. There must be an expression, it cannot fail; but what it is to be, this or that, is determined by the historical and psychological conditions of the individual who is speaking. The quality of the expression is not deducible from the nature of the concept. There does not exist a true (logical) sense of words. He who forms a concept bestows on each occasion their true meaning on the words. [Sidenote] _Distinction between logical and non-logical judgements._ This being established, the only truly logical (that is, aesthetico-logical) propositions, the only rigorously logical judgments, can be nothing but those whose proper and exclusive content is the determination of a concept. These propositions or judgments are the _definitions_. Science itself is nothing but a complex of definitions, unified in a supreme definition; a system of concepts, or chief concept.