Of all difficulties which impede the progress of thought, and the formation of well-grounded opinions on life and social arrangements, the greatest is now the unspeakable ignorance and inattention of mankind in respect to the influences which form human character. Whatever any portion of the human species now are, or seem to be, such, it is supposed, they have a natural tendency to be: even when the most elementary knowledge of the circumstances in which they have been placed, clearly points out the causes that made them what they are. Because a cottier deeply in arrears to his landlord is not industrious, there are people who think that the Irish are naturally idle. Because constitutions can be overthrown when the authorities appointed to execute them turn their arms against them, there are people who think the French incapable of free government. Because the Greeks cheated the Turks, and the Turks only plundered the Greeks, there are persons who think that the Turks are naturally more sincere: and because women, as is often said, care nothing about politics except their personalities, it is supposed that the general good is naturally less interesting to women than to men. History, which is now so much better understood than formerly, teaches another lesson: if only by showing the extraordinary susceptibility of human nature to external influences, and the extreme variableness of those of its manifestations which are supposed to be most universal and uniform. But in history, as in travelling, men usually see only what they already had in their own minds; and few learn much from history, who do not bring much with them to its study.