Our thought cannot advance in the definite work of building up science without producing and employing a definite logical structure with fixed principles: these principles are immanent in the work of thought; they are above all the caprice and all the differences of the individuals. This logical structure cannot be carried over and applied to the world around us, as all scientific research carries it over and applies it, without implicitly presupposing an objective logic of things, a conceivability of experience: in this, man does not simply project externally and apply mechanically forms already existing in a complete and final state within him. For the multiplicity of things not only gives to those principles a particular form, in the production of which they must themselves participate, but through the relation to the world the fundamental forms are also further developed in their nature as a whole; it is only with the co-operation of both sides that the thought-structure achieves what is ultimately reached. The chief thing is that thought actually transcends the state of contemplative reflection, and advances to fully active work; that out of the movement of our thought proceed further developments, which extend to the object also; that, moreover, we come under the compulsion of inner necessities, and, possessing the highest freedom, are raised securely above all caprice. This creative thought in us, which is at the same time our own thought, constitutes a witness to a meeting of our thought with a thought that has its basis in things and in the whole. Inability to imagine such a thought should never lead to the denial of an absolute logic, with which all scientific research stands or falls. The disclosure of this relation, however, gives to our thought, in the midst of all doubt, a firm foundation, a joyful certainty, an infinite task.