“Public policy does not admit of definition and is not easily explained. It is a variable quantity; it must vary and does vary with the habits, capacities, and opportunities of the public.”

Source: 1860s, Allow the humblest man an equal chance (1860)
Context: No policy that does not rest upon some philosophical public opinion can be permanently maintained. And hence, there are but two policies in regard to Slavery that can be at all maintained. The first, based on the property view that Slavery is right, conforms to that idea throughout, and demands that we shall do everything for it that we ought to do if it were right. We must sweep away all opposition, for opposition to the right is wrong; we must agree that Slavery is right, and we must adopt the idea that property has persuaded the owner to believe — that Slavery is morally right and socially elevating. This gives a philosophical basis for a permanent policy of encouragement. The other policy is one that squares with the idea that Slavery is wrong, and it consists in doing everything that we ought to do if it is wrong. [... ] I don't mean that we ought to attack it where it exists. To me it seems that if we were to form a government anew, in view of the actual presence of Slavery we should find it necessary to frame just such a government as our fathers did; giving to the slaveholder the entire control where the system was established, while we possessed the power to restrain it from going outside those limits. From the necessities of the case we should be compelled to form just such a government as our blessed fathers gave us; and, surely, if they have so made it, that adds another reason why we should let Slavery alone where it exists.