tter, in all its operations, is actuated by a necessary force, and that every natural effect is so precisely determined by the energy of its cause that no other effect, in such particular circumstances, could possibly have resulted from it" (Hume 365). He names this principle the doctrine of necessity to suggest the cause-effect relationship he describes is a universal truth that is virtually indubitable. Uniformity within a specific subject is discovered as various like conditions produce similar consequences. He explains: "[When] similar objects are constantly conjoined together, [the] mind is determined by custom to infer the one from the appearance of the other" (Hume 366).
This same principle of uniformity can be transferred from the natural world to the human interactions, as there is uniformity in the actions of man. Hume cites the importance of history, as it clues us in to universal principles of mankind: "The general observations treasured up by a course of e
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