Let this serve as an outline of the good; for we must presumably
first sketch it roughly, and then later fill in the details. But it
would seem that any one is capable of carrying on and articulating
what has once been well outlined, and that time is a good discoverer
or partner in such a work; to which facts the advances of the arts are
due; for any one can add what is lacking. And we must also remember
what has been said before, and not look for precision in all things
alike, but in each class of things such precision as accords with
the subject-matter, and so much as is appropriate to the inquiry.
For a carpenter and a geometer investigate the right angle in
different ways; the former does so in so far as the right angle is
useful for his work, while the latter inquires what it is or what sort
of thing it is; for he is a spectator of the truth. We must act in the
same way, then, in all other matters as well, that our main task may
not be subordinated to minor questions. Nor must we demand the cause
in all matters alike; it is enough in some cases that the fact be well
established, as in the case of the first principles; the fact is the
primary thing or first principle. Now of first principles we see
some by induction, some by perception, some by a certain
habituation, and others too in other ways.
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