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cession of events can be watched, but there
˜
can be no A priori anticipations. Experi-
ence alone, in both cases, leads to the idea
of cause and effect as a principle that seems
to dominate our present universe, as a rule
for predicting the course of events, and as
a guide to the choice of a course of action.
This idea of cause and effect is the most po-
tent factor in developing the history of the
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