The rapidity with which ideas grow old in our memories is in a direct ratio to the squares of their importance. Their apparent age runs up miraculously, like the value of diamonds, as they increase in magnitude. A great calamity, for instance, is as old as the trilobites an hour after it has happened. It stains backward through all the leaves we have turned over in the book of life, before its blot of tears or of blood is dry on the page we are turning. For this we seem to have lived; it was foreshadowed in dreams that we leaped out of in the cold sweat of terror; in the “dissolving views” of dark day-visions; all omens pointed to it; all paths led to it. After the tossing half-forgetfulness of the first sleep that follows such an event, it comes upon us afresh, as a surprise, at waking; in a few moments it is old again, — as old as eternity.