However, as the true object of legislation is only perceived by a few, and most men are almost incapable of grasping it, though they live under its conditions, legislators, with a view to exacting general obedience, have wisely put forward another object, very different from that which necessarily follows from the nature of law: they promise to the observers of the law that which the masses chiefly desire, and threaten its violators with that which they chiefly fear: thus endeavoring to restrain the masses, as far as may be, like a horse with a curb; whence it follows that the word law is chiefly applied to the modes of life enjoined on men by the sway of others; hence those who obey the law are said to live under it and to be under compulsion. In truth, a man who renders every one their due because he fears the gallows, acts under the sway and compulsion of others, and cannot be called just. But a man who does the same from a knowledge of the true reason for laws and their necessity, acts from a firm purpose and of his own accord, and is therefore properly called just. This, I take it, is Paul's meaning when he says, that those who live under the law cannot be justified through the law, for justice, as commonly defined, is the constant and perpetual will to render every man his due. Thus Solomon says (Prov. xxi. 15), "It is a joy to the just to do judgment," but the wicked fear.
Law, then, being a plan of living which men have for a certain object laid down for themselves or others, may, as it seems, be divided into human law and Divine law.
By human law I mean a plan of living which serves only to render life and the state secure.
By Divine law I mean that which only regards the highest good, in other words, the true knowledge of God and love.
I call this law Divine because of the nature of the highest good, which I will here shortly explain as clearly as I can.
Inasmuch as the intellect is the best part of our being, it is evident that we should make every effort to perfect it as far as possible if we desire to search for what is really profitable to us. For in intellectual perfection the highest good should consist. Now, since all our knowledge, and the certainty which removes every doubt, depend solely on the knowledge of God;—firstly, because without God nothing can exist or be conceived; secondly, because so long as we have no clear and distinct idea of God we may remain in universal doubt—it follows that our highest good and perfection also depend solely on the knowledge of God. Further, since without God nothing can exist or be conceived, it is evident that all natural phenomena involve and express the conception of God as far as their essence and perfection extend, so that we have greater and more perfect knowledge of God in proportion to our knowledge of natural phenomena: conversely (since the knowledge of an effect through its cause is the same thing as the knowledge of a particular property of a cause) the greater our knowledge of natural phenomena, the more perfect is our knowledge of the essence of God (which is the cause of all things). So, then, our highest good not only depends on the knowledge of God, but wholly consists therein; and it further follows that man is perfect or the reverse in proportion to the nature and perfection of the object of his special desire; hence the most perfect and the chief sharer in the highest blessedness is he who prizes above all else, and takes especial delight in the intellectual knowledge of God, the most perfect Being.
Hither, then, our highest good and our highest blessedness aim—namely, to the knowledge and love of God; therefore the means demanded by this aim of all human actions, that is, by God in so far as the idea of him is in us, may be called the commands of God, because they proceed, as it were, from God Himself, inasmuch as He exists in our minds, and the plan of life which has regard to this aim may be fitly called the law of God.
The nature of the means, and the plan of life which this aim demands, how the foundations of the best states follow its lines, and how men's life is conducted, are questions pertaining to general ethics. Here I only proceed to treat of the Divine law in a particular application.
As the love of God is man's highest happiness and blessedness, and the ultimate end and aim of all human actions, it follows that he alone lives by the Divine law who loves God not from fear of punishment, or from love of any other object, such as sensual pleasure, fame, or the like; but solely because he has knowledge of God, or is convinced that the knowledge and love of God is the highest good. The sum and chief precept, then, of the Divine law is to love God as the highest good, namely, as we have said, not from fear of any pains and penalties or from the love of any other object in which we desire to take pleasure. The idea of God lays down the rule that God is our highest good—in other words, that the knowledge and love of God is the ultimate aim to which all our actions should be directed. The worldling cannot understand these things, they appear foolishness to him, because he has too meager a knowledge of God, and also because in this highest good he can discover nothing which he can handle or eat, or which affects the fleshly appetites wherein he chiefly delights, for it consists solely in thought and the pure reason. They, on the other hand, who know that they possess no greater gift than intellect and sound reason, will doubtless accept what I have said without question.
We have now explained that wherein the Divine law chiefly consists, and what are human laws, namely, all those which have a different aim unless they have been ratified by revelation, for in this respect also things are referred to God (as we have shown above) and in this sense the law of Moses, although it was not universal, but entirely adapted to the disposition and particular preservation of a single people, may yet be called a law of God or Divine law, inasmuch as we believe that it was ratified by prophetic insight. If we consider the nature of natural Divine law as we have just explained it, we shall see