We may hope that the growing influence of enlightened sentiment will promote the permanent peace of the world. Wars to maintain family alliances, to uphold or to cast down dynasties, and to regulate successions to thrones, which have occupied so much room in the history of modern times, if not less likely to happen at all, will be less likely to become general and involve many nations, as the great principle shall be more and more established, that the interest of the world is peace, and its first great statute that every nation possesses the power of establishing a government for itself. But public opinion has attained also an influence over governments which do not admit the popular principle into their organization. A necessary respect for the judgment of the world operates, in some measure, as a control over the most unlimited forms of authority. It is owing, perhaps, to this truth, that the interesting struggle of the Greeks has been suffered to go on so long, without a direct interference, either to wrest that country from its present masters, or to execute the system of pacification by force, and, with united strength, lay the neck of Christian and civilized Greek at the foot of the barbarian Turk. Let us thank God that we live in an age when something has influence besides the bayonet, and when the sternest authority does not venture to encounter the scorching power of public reproach. Any attempt of the kind I have mentioned should be met by one universal burst of indignation; the air of the civilized world ought to be made too warm to be comfortably breathed by any one who would hazard it. [Sidenote: The Greek struggle for independence.] It is, indeed, a touching reflection, that, while, in the fulness of our country's happiness, we rear this monument to her honor, we look for instruction in our undertaking to a country which is now in fearful contest, not for works of art or memorials of glory, but for her own existence.[12] Let her be assured that she is not forgotten in the world; that her efforts are applauded, and that constant prayers ascend for her success. And let us cherish a confident hope for her final triumph. If the true spark of religious and civil liberty be kindled, it will burn. Human agency cannot extinguish it. Like the earth's central fire, it may be smothered for a time; the ocean may overwhelm it; mountains may press it down; but its inherent and unconquerable force will heave both the ocean and the land, and at some time or other, in some place or other, the volcano will break out and flame up to heaven. [Sidenote: South American liberty.]