Adapted from The Common Law, by Oliver Wendell Holmes, Jr. (1881)

To present a general view of the Common Law, other tools are needed besides logic. It is something to show that the consistency of a system requires a particular result, but it is not all. The life of the law has not been logic: it has been experience. The felt necessities of the time, the prevalent moral and political theories, intuitions of public policy, avowed or unconscious, even the prejudices which judges share with their fellow-men, have had a good deal more to do than the syllogism in determining the rules by which men should be governed. The law embodies the story of a nation's development through many centuries, and it cannot be dealt with as if it contained only the axioms and corollaries of a book of mathematics. In order to know what it is, we must know what it has been, and what it tends to become. We must alternately consult history and existing theories of legislation. But the most difficult labor will be to understand the combination of the two into new products at every stage. The substance of the law at any given time pretty nearly corresponds, so far as it goes, with what is then understood to be convenient; but its form and machinery, and the degree to which it is able to work out desired results, depend very much upon its past.

In Massachusetts today, while, on the one hand, there are a great many rules which are quite sufficiently accounted for by their manifest good sense, on the other, there are some which can only be understood by reference to the infancy of procedure among the German tribes, or to the social condition of Rome under the Decemvirs.

I shall use the history of our law so far as it is necessary to explain a conception or to interpret a rule, but no further. In doing so there are two errors equally to be avoided both by writer and reader. One is that of supposing, because an idea seems very familiar and natural to us, that it has always been so. Many things which we take for granted have had to be laboriously fought out or thought out in past times. The other mistake is the opposite one of asking too much of history. We start with man full grown. It may be assumed that the earliest barbarian whose practices are to be considered, had a good many of the same feelings and passions as ourselves.

Adapted from The Common Law by Oliver Wendell Holmes, Jr. (1881)

If it were necessary to trench further upon the field of morals, it might be suggested that the dogma of equality applied even to individuals only within the limits of ordinary dealings in the common run of affairs. You cannot argue with your neighbor, except on the admission for the moment that he is as wise as you, although you may by no means believe it. In the same way, you cannot deal with him, where both are free to choose, except on the footing of equal treatment, and the same rules for both. The ever-growing value set upon peace and the social relations tends to give the law of social being the appearance of the law of all being. But it seems to me clear that the ultima ratio, not only regum, but of private persons, is force, and that at the bottom of all private relations, however tempered by sympathy and all the social feelings, is a justifiable self-preference. If a man is on a plank in the deep sea that will only float one, and a stranger lays hold of it, he will thrust him off if he can. When the state finds itself in a similar position, it does the same thing.

The considerations that answer the argument of equal rights also answer the objections to treating man as a thing, and the like. If a man lives in society, he is liable to find himself so treated. The degree of civilization which a people has reached, no doubt, is marked by their anxiety to do as they would be done by. It may be the destiny of humanity that the social instincts shall grow to control our actions absolutely, even in anti-social situations. But they have not yet done so, and as the rules of law are or should be based upon a morality that is generally accepted, no rule founded on a theory of absolute unselfishness can be laid down without a breach between law and working beliefs.

If it be true, as I shall presently try to show, that the general principles of criminal and civil liability are the same, it will follow from that alone that theory and fact agree in frequently punishing those who have been guilty of no moral wrong, and who could not be condemned by any standard that did not avowedly disregard the personal peculiarities of the individuals concerned. If punishment stood on the moral grounds that are proposed for it, the first thing to be considered would be those limitations in the capacity for choosing rightly that arise from abnormal instincts, want of education, lack of intelligence, and all the other defects which are most marked in the criminal classes. I do not say that they should not be, or at least I do not need to for my argument. I do not say that the criminal law does more good than harm. I only say that it is not enacted or administered on that theory.