" {39}
Those who accept evolution insist on unbroken physical continuity
between the earliest known life and ourselves, so that we both are
and are not personally identical with the unicellular organism from
which we have descended in the course of many millions of years,
exactly in the same way as an octogenarian both is and is not
personally identical with the microscopic impregnate ovum from which
he grew up. Everything both is and is not. There is no such thing
as strict identity between any two things in any two consecutive
seconds. In strictness they are identical and yet not identical, so
that in strictness they violate a fundamental rule of strictness--
namely, that a thing shall never be itself and not itself at one and
the same time; we must choose between logic and dealing in a
practical spirit with time and space; it is not surprising,
therefore, that logic, in spite of the show of respect outwardly
paid to her, is told to stand aside when people come to practice.
In practice identity is generally held to exist where continuity is
only broken slowly and piecemeal, nevertheless, that occasional
periods of even rapid change are not held to bar identity, appears
from the fact that no one denies this to hold between the
microscopically small impregnate ovum and the born child that
springs from it, nor yet, therefore, between the impregnate ovum and
the octogenarian into which the child grows; for both ovum and
octogenarian are held personally identical with the newborn baby,
and things that are identical with the same are identical with one
another.
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