But a logic applicable to this higher science must be understood in a far more comprehensive sense than is ordinarily done. And this is even what we have here attempted to furnish. Logic in general is conversant about three objects: the notion, the judgment, and the conclusion. But it ought also to possess a general fundamental rule and regulative standard of truth, so far as this is attainable. But inasmuch as in this domain the eternal is simply one, so also for this higher science one notion properly is sufficient; as also one judgment which comprises all others, and one conclusion which completes the whole, is sufficient. The act of understanding has been explained to be the completion of the notion; and the full and complete apprehension of the eternal truth, or of Him who is the sum of all verities, was the subject-matter of our ninth treatise. The act of discerning was explained to be the completion of the judgment; and this perfect judgment, which decides and distinguishes between truth and error, was the theme of our tenth disquisition. Science, however, is the perfection of all thinking, and in its actual operation, as applied to life, and in itself carried to a conclusion, is one with it. Now this was the end to which the present discussion and development was intended to lead; while the further prosecution of it and its reference to the several spheres and domains of existence must be reserved to the following discourses. LECTURE XII. OF THE SYMBOLICAL NATURE AND CONSTITUTION OF LIFE WITH REFERENCE TO ART AND THE MORAL RELATIONS OF MAN.