"My own conclusion is that history is simply social development along the lines of weakest resistance, and that in most cases the line of weakest resistance is found as unconsciously by society as by water."

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But that the reasoning from these facts, the drawing from them correct conclusions, is a matter of great difficulty, may be inferred from the imperfect state in which the Science is now found after it has been so long and so intensely studied.

— Nassau William Senior