In the Speculative or Theoretical sciences, we prove a doctrine by

referring it to some other doctrine or doctrines, until we come at
last to some assumption that must be rested in as ultimate or final
In the Speculative or Theoretical sciences, we prove a doctrine by
referring it to some other doctrine or doctrines, until we come at
last to some assumption that must be rested in as ultimate or final.
We can prove the propositions of Euclid, the law of gravitation, the
law of atomic proportions, the law of association; we cannot prove our
present sensations, nor can we demonstrate that what has been, will
be. The ultimate data must be accepted as self-evident; they have no
higher authority than that mankind generally are disposed to accept
them.


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