each thing is a half, and suggests another thing to make it whole; as,
spirit, matter; man, woman; odd, even; subjective, objective; in, out;
upper, under; motion, rest; yea, nay.

Whilst the world is thus dual, so is every one of its parts. The
entire system of things gets represented in every particle. There is
somewhat that resembles the ebb and flow of the sea, day and night,
man and woman, in a single needle of the pine, in a kernel of corn, in
each individual of every animal tribe. The reaction, so grand in the
elements, is repeated within these small boundaries. For example, in
the animal kingdom the physiologist has observed that no creatures
are favorites, but a certain compensation balances every gift and
every defect. A surplusage given to one part is paid out of a
reduction from another part of the same creature. If the head and neck
are enlarged, the trunk and extremities are cut short.

The theory of the mechanic forces is another example. What we gain in
power is lost in time; and the converse. The periodic or compensating
errors of the planets is another instance. The influences of climate
and soil in political history is another. The cold climate
invigorates. The barren soil does not breed fevers, crocodiles,
tigers, or scorpions.

The same dualism underlies the nature and condition of man. Every
excess causes a defect; every defect an excess. Every sweet hath its
sour; every evil its good. Every faculty which is a receiver of
pleasure has an equal penalty put on its abuse. It is to answer for
its moderation with its life. For every grain of wit there is a grain
of folly. For everything you have missed, you have gained something
else; and for everything you gain, you lose something. If riches