The principle of the moral destination of our nature--that only by endless progress can we come into full harmony with the moral law--is of the greatest use, not only for fortifying the speculative reason, but also with respect to religion. In default of this, either the moral law is degraded from its holiness, being represented as indulging our convenience, or else men strain after an unattainable aim, hoping to gain absolute holiness of will, thus losing themselves in fanatical theosophic dreams utterly contradicting self-knowledge.
For a rational, but finite, being the only possibility is an endless progression from the lower to the higher degrees of perfection. The Infinite Being, to whom the time condition is nothing, sees in this endless succession the perfect harmony with the moral law.
The Existence of God
The pure practical reason must also postulate the existence of God as the necessary condition of the attainment of the summum bonum. As the perfect good can only be promoted by accordance of the will with the moral law, so also this summum bonum is possible only through the supremacy of an Infinite Being possessed of causality harmonising with morality. But the postulate of the highest derived good (sometimes denominated the best world) coincides with the postulate of a highest original good, or of the existence of God.
We now perceive why the Greeks could never solve their problem of the possibility of the summum bonum, because they made the freedom of the human will the only and all-sufficient ground of happiness, imagining there was no need for the existence of God for that end. Christianity alone affords an idea of the summum bonum which answers fully to the requirement of practical reason. That idea is the Kingdom of God.
The holiness which the Christian law requires makes essential an infinite progress. But just for that very reason it justifies in man the hope of endless existence. And it is only from an Infinite Supreme Being, morally perfect, holy, good and with an omnipotent will, that we can hope, by accord with His will, to attain the summum bonum, which the moral law enjoins on us as our duty to seek ever to attain.
The moral law does not enjoin on us to render ourselves happy, but instructs us how to become worthy of happiness. Morality must never be regarded as a doctrine of happiness, or direction how to become happy, its province being to inculcate the rational condition of happiness, not the means of attaining it. God's design in creating the world is not primarily the happiness of the rational beings in it, but the summum bonum, which super-adds another condition to that desire of human beings, namely, the condition of deserving such happiness. That is to say, the morality of rational beings is a condition which alone includes the rule by observing which they can hope to participate in happiness at the hand of an all-wise Creator.
The highest happiness can only be conceived as possible under conditions harmonising with the divine holiness. Thus they are right who make the glory of God the chief end of creation. For beyond all else that can be conceived, that glorifies God which is the most estimable thing in the whole world, honour for His command and obedience to His law, when to this is added His glorious design to crown so beauteous an order of things with happiness corresponding.
Two things fill the mind with ever new and increasing wonder--the starry heavens above me, and the moral law within me. I need not search for them, and vaguely guess concerning them, as if they were veiled in darkness or hidden in the infinite altitude. I see them before me, and link them immediately with the consciousness of my existence. The former begins from the spot I occupy in the outer world of sense, and enlarges my connexion with it to a boundless extent with worlds upon worlds and systems of systems.
The second begins with my invisible self, my personality, and places me in a truly infinite world traceable only by the understanding, with which I perceive I am in an universal and necessary connexion, as I am also thereby with all those visible worlds.
This view infinitely elevates my value as an intelligence by my personality, in which the moral law reveals to me a life independent of the animal and even the whole material world, and reaching by destiny into the infinite.
But though admiration may stimulate inquiry, it cannot compensate for the want of it. The contemplation of the world, beginning with the most magnificent spectacle possible, ended in astrology; and morality, beginning with the noblest attribute of human nature, ended in superstition. But after reason was applied to careful examination of the phenomena of nature a clear and unchangeable insight was secured into the system of the world. We may entertain the hope of a like good result in treating of the moral capacities of our nature by the help of the moral judgement of reason.
The World's Greatest Books (Philosophy and Economics), Vol. XIV, p. 41-44