g. drinking the
medicine is necessary in order that we may be cured of disease, and
a man's sailing to Aegina is necessary in order that he may get his
money.-(2) The compulsory and compulsion, i.e. that which impedes
and tends to hinder, contrary to impulse and purpose. For the
compulsory is called necessary (whence the necessary is painful, as
Evenus says: 'For every necessary thing is ever irksome'), and
compulsion is a form of necessity, as Sophocles says: 'But force
necessitates me to this act'. And necessity is held to be something
that cannot be persuaded-and rightly, for it is contrary to the
movement which accords with purpose and with reasoning.-(3) We say
that that which cannot be otherwise is necessarily as it is. And
from this sense of 'necessary' all the others are somehow derived; for
a thing is said to do or suffer what is necessary in the sense of
compulsory, only when it cannot act according to its impulse because
of the compelling forces-which implies that necessity is that
because of which a thing cannot be otherwise; and similarly as regards
the conditions of life and of good; for when in the one case good,
in the other life and being, are not possible without certain
conditions, these are necessary, and this kind of cause is a sort of
necessity. Again, demonstration is a necessary thing because the
conclusion cannot be otherwise, if there has been demonstration in the
unqualified sense; and the causes of this necessity are the first
premisses, i.e. the fact that the propositions from which the
syllogism proceeds cannot be otherwise.
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