All confess this to be true, each in his own words. They talk of this age as one of change; of rapid progress, for good or evil; of unexpected discoveries; of revolutions, intellectual, moral, social, as well as political. Our notions of the physical universe are rapidly altering, with the new discoveries of science; and our notions of ethics and theology are altering as rapidly. The era assumes a different aspect to different minds, just as it did the first century after Christ, according as men look forward to the future with hope, or back to the past with regret. Some glory in the nineteenth century as one of rapid progress for good; as the commencement of a new era for humanity; as the inauguration of a Reformation as grand as that of the sixteenth century. Others bewail it as an age of rapid decay; in which the old landmarks are being removed, the old paths lost; in which we are rushing headlong into skepticism and atheism; in which the world and the Church are both in danger, and the last day is at hand. Both parties may be right; and yet both may be wrong. Men have always talked thus, at great crises in the world's life. They talked thus in the first century; and in the fifth, and in the eleventh; and again in the sixteenth; and then both parties were partially right and partially wrong; and so they may be now. What they meant to say, what they wanted to say, what we mean and want to say, has been said already for us in far deeper, wider, and more accurate words, by him who wrote this wonderful Epistle to the Hebrews, when he told the Jews of his time that the Lord was shaking the heavens and the earth, that those things which were shaken might be removed, as things that are made--cosmogonies, systems, theories, prejudices, fashions, of man's invention: while those things which could not be shaken might remain, because they were according to the mind and will of God, eternal as that source from whence they came forth, even the bosom of God the Father. "Yet once more I shake, not the earth only, but also heaven."