False principles, which correspond with the bad as well as with the just aspirations of mankind, are a normal and necessary element in the social life of nations.
The science of politics is the one science that is deposited by the streams of history, like the grains of gold in the sand of a river; and the knowledge of the past, the record of truths revealed by experience, is eminently practical, as an instrument of action and a power that goes to making the future.
A public man has no right to let his actions be determined by particular interests. He does the same thing as a judge who accepts a bribe. Like a judge he must consider what is right, not what is advantageous to a party or class.
