of thinking and sensation alike correspond to certain movements of the
internal sensorium. All this goes to make up the organism of the soul's
activities.

But matter is spoil stolen from the eternal change, and wears itself
away, even as it works; in its movement its very element is driven from
its grooves, chased away and lost. Because now, on the contrary, that
simple essence, the soul, possesses in itself permanence and stability,
and in its essence neither gains nor loses aught,--matter cannot keep
step with the activity of the spirit, and there would thus soon be an end
of the organism of spiritual life, and therewith of all action of the
soul. To prevent which there must be added to the first system or
organic powers a second one, which shall make good the losses sustained,
and sustain the decay by a chain of new creations ready to take the place
of those that have gone. This is the organism of maintenance.

Still further. After a short period of activity, when the equal balance
of loss and reparation is once removed, man quits the stage of life, and
the law of mortality depopulates the earth. There is not room enough for
the multitude of sentient beings, whom eternal love and wisdom seemed to
have called to a happy existence, to live side by side within the narrow
boundaries of our world, and the life of one generation shuts out the
life of another. Therefore was it necessary that new men should appear,
to take the place of those who had departed, and that life should be kept
up in unbroken succession. But of creation there is no longer any trace;
what now becomes new becomes so only by development. The development of
man must come to pass through man, if it is to bear a proportion to the
original number, if man is to be cultivated into man. On this account a
new system of organic powers was added to the two that had preceded it,
which had for its object to quicken and to develop the seed of humanity.