The two forms of knowledge, æsthetic and intellectual or conceptual, are indeed different, but this does not altogether amount to separation and disjunction, as of two forces each pulling in its own direction. If we have shown that the æsthetic form is altogether independent of the intellectual and suffices to itself without external support, we have not said that the intellectual can stand without the æsthetic. To describe the independence as _reciprocal_ would not be true. What is knowledge by concepts? It is knowledge of the relations of things, and things are intuitions. Concepts are not possible without intuitions, just as intuition is itself impossible without the matter of impressions. Intuitions are: this river, this lake, this brook, this rain, this glass of water; the concept is: water, not this or that appearance and particular example of water, but water in general, in whatever time or place it be realized; the material of infinite intuitions, but of one single constant concept. But the concept, the universal, if it be no longer intuition in one respect, is intuition in another respect, and cannot fail of being intuition. The man who thinks has impressions and emotions, in so far as he thinks. His impression and emotion will be not love or hate, not the passion of the man who is not a philosopher, not hate or love for certain objects and individuals, but _the effort of his thought itself,_ with the pain and the joy, the love and the hate joined to it. This effort cannot but assume an intuitive form, in becoming objective to the spirit. To speak is not to think logically; but to _think logically_ is also to _speak._ [Sidenote: _Criticism of the negations of this thesis._] That thought cannot exist without speech, is a truth generally admitted. The negations of this thesis are all founded on equivocations and errors. The first of the equivocations is that of those who observe that one can likewise think with geometrical figures, algebraical numbers, ideographic signs, without any word, even pronounced silently and almost insensibly within one; that there are languages in which the word, the phonetic sign, expresses nothing, unless the written sign also be examined, and so on. But when we said "speak," we intended to employ a synecdoche, by which was to be understood "expression" in general, for we have already remarked that expression is not only so-called verbal expression. It may or may not be true that certain concepts may be thought without phonetic manifestations. But the very examples adduced to show this also prove that those concepts never exist without expressions.