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but seldom. And as the rule must contain the element of necessity, it must be a priori.

1866 March

Liberty & Necessity

Suppose a man is in a room locked in and does not [want?]
to go out, so that his staying is voluntary; is he at liberty? No
But suppose that if he were to had wished to go out the doors
would be unlocked, was he then at liberty? Yes. Now this is
the situation of every man upon the theory of necessity. He prefers
to do a certain thing & he cannot do otherwise, but yet if he should
prefer to do otherwise he could do so. So that liberty & necessity do
not conflict.