Earth's upward struggle has been baffled by so many stumbles that critics have not been lacking to suggest that we do not advance at all, but only swing in circles, like a squirrel in its cage. Certain it is that each ancient civilization seemed to bear in itself the seeds of its own destruction. Yet it may be held with equal truth that each new power, rising above the ruins of the last, held something nobler, was borne upward by some truth its rival could not reach. At no period is this more evident than in the five centuries immediately preceding the Christian era. Persia, Greece,.
