Liberty, next to religion, has been the motive of good deeds and the common pretext of crime, from the sowing of the seed at Athens, two thousand four hundred and sixty years ago, until the ripened harvest was gathered by men of our race. It is the delicate fruit of a mature civilisation; and scarcely a century has passed since nations, that knew the meaning of the term, resolved to be free. In every age its progress has been beset by its natural enemies, by ignorance and superstition, by lust of conquest and by love of ease, by the strong man's craving for power, and the poor man's craving for food. During long intervals it has been utterly arrested, when nations were being rescued from barbarism and from the grasp of strangers, and when the perpetual struggle for existence, depriving men of all interest and understanding in politics, has made them eager to sell their birthright for a mess of pottage, and ignorant of the treasure they resigned. At all times sincere friends of freedom have been rare, and its triumphs have been due to minorities, that have prevailed by associating themselves with auxiliaries whose objects often differed from their own; and this association, which is always dangerous, has been sometimes disastrous, by giving to opponents just grounds of opposition, and by kindling dispute over the spoils in the hour of success. No obstacle has been so constant, or so difficult to overcome, as uncertainty and confusion touching the nature of true liberty. If hostile interests have wrought much injury, false ideas have wrought still more; and its advance is recorded in the increase of knowledge, as much as in the improvement of laws. The history of institutions is often a history of deception and illusions; for their virtue depends on the ideas that produce and on the spirit that preserves them, and the form may remain unaltered when the substance has passed away.