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And what is the dire necessity and "iron" law under which men groan?
Truly, most gratuitously invented bugbears. I suppose if there be an
"iron" law, it is that of gravitation; and if there be a physical
necessity, it is that a stone, unsupported, must fall to the ground. But
what is all we really know, and can know, about the latter phenomenon?
Simply, that, in all human experience, stones have fallen to the ground
under these conditions; that we have not the smallest reason for
believing that any stone so circumstanced will not fall to the ground;
and that we have, on the contrary, every reason to believe that it will
so fall. It is very convenient to indicate that all the conditions of
belief have been fulfilled in this case, by calling the statement that
unsupported stones will fall to the ground, "a law of Nature." But when,
as commonly happens, we change _will_ into _must_, we introduce an idea
of necessity which most assuredly does not lie in the observed facts,
and has no warranty that I can discover elsewhere.


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