Kant undertook to make an exact science of the necessary and universal ideas of the human mind, such as logic and mathematics, which are parts of human knowledge; to this end he wrote Critique of Pure Reason, afterwards he composed another work, the Critique of Practical Reason. Practical reason may also be called pure, in as much as it does not allow itself to be influenced by anything but what proceeds from itself, and reason becomes practical when it seeks an independent principle which determines the will. This principle is formulated by Kant in the following terms: “Let each individual follow commands which may be considered as a universal law imposed alike on all human beings.”
This law, which man possesses in his conscience, does not stop half way in its exactions from man since it aims at perfection, it commands man to love his neighbour, and to do good even to his enemy. To love and to do acts of kindness when pleasant to oneself is natural, and requires no command, but, otherwise, a law is required to coerce the will, the man who submits is free, since he can choose to infringe or to obey it; obedience to the moral law constitutes duty, which must be accomplished because it is our duty, and embodies the satisfaction felt in its performance.
Man is under an obligation to be moral and to do his duty, but not necessarily to be happy, yet he demands happiness. The union of virtue and happiness being the summum bonum, we must acknowledge the existence of a power external to ourselves, endowed with intellect and will, which makes this union possible; this power is known to us by the name of God. The perfect good is holiness; this life is too short to enable us to attain to it in its perfection, it is therefore a necessity that our life should be prolonged beyond the term of years spent on this earth, thus we are assured of the survival of the soul after what we term death.
Thus Kant speaks in his Critique of Practical Reason.
I may now be permitted to speak and give my own opinion. I hear the Positivist perhaps say: “This result might be considered conceivable if all that has been previously said were true; but to infer from the desire for happiness that a supernatural power must infallibly satisfy it might be a hallucination, or at least a hypothesis.” If this were so we need not deride hypotheses; in the domain of human knowledge reason would not be itself if it never made ventures in scientific discoveries; its path starts from the possible in making excursions from the known to the unknown, in going from darkness to light—hence then hypothesis.
There is also this fact to notice, some of the most important of our acts are not guided by reason, it acts as a spectator; for instance, reason is not active when we have perception of an object, and intuitions occur in us without the intervention of reason.
This was well understood by certain men who have come forward from time to time from the multitude, the bearers of inspired messages to the world; they have spoken of those things which “eye hath not seen nor ear heard,” and they were hard to be understood of the people; but each one alike said: “I give no proof of the truth of what I assert; do as I say, and you will know the truth of my words.”
There remains little more to be said on the subject of Kant. There is a serious omission in the system of this profound thinker.
Nothing has so stopped the progress of Darwin’s great conception as the injudicious efforts of his so-called disciples to bring it to perfection. Instead of correcting their chief, they should have weighed thoughtfully all Kant’s arguments against the materialism of his adversaries, and have sought to refute them; if they had succeeded in proving that Kant makes a mistake when he admits that there is in man a principle quite distinct from his body, they would have been authorised in replacing Darwin’s theory by their own; if they had not succeeded, Darwin and his theory would have remained unshaken, but they would be annihilated.
Max Müller examines the question from another point of view. “We admit that as we know nothing, except by analogy, of the mind of animals, we could not with the weapons that Kant has placed in our hands, make head against the assertion that they might possess, for all we know, the same forms of sensuous intuition and the same categories of the understanding which we possess. Nothing, therefore, could have been said from a purely philosophical point of view, against treating man as a mere variety of some other genus of animals.”[65] But as the origin of language was to Kant less than a secondary question—it might almost be said to have no existence for him—it belongs to the science of language to show, what Kant had never shown, that for all human knowledge not only were percepts and concepts necessary, but also names. How was it that it did not occur to Kant since he perceived that there were mathematics of the forms or manifestations of sensation, namely, time or duration and space? He said well: Each object of which we think is attached in time or space to another; this can only be done by the use of such indications as now, then, here, there; and he saw in this gradation of perception, the first step towards the act of counting, that is to say of reasoning, and consequently of speaking; all of which was comprehended by the Greeks in their word Logos. As an instance the word cent exists in every language, but cent in French consists only of four letters placed side by side one after the other, and would never be anything else to us if we could not count; but to count is to add and to take away, that is to say, addition and subtraction, thus to conceive and name; in order to possess a hundred objects, it does not suffice to see them only, it is necessary to count them up to the hundred.