For it is but a very obscure idea of power which reaches
not the production of the action, but the continuation of the passion.
For so is motion in a body impelled by another; the continuation of
the alteration made in it from rest to motion being little more an
action, than the continuation of the alteration of its figure by the
same blow is an action. The idea of the beginning of motion we have
only from reflection on what passes in ourselves; where we find by
experience, that, barely by willing it, barely by a thought of the
mind, we can move the parts of our bodies, which were before at
rest. So that it seems to me, we have, from the observation of the
operation of bodies by our senses, but a very imperfect obscure idea
of active power; since they afford us not any idea in themselves of
the power to begin any action, either motion or thought. But if,
from the impulse bodies are observed to make one upon another, any one
thinks he has a clear idea of power, it serves as well to my
purpose; sensation being one of those ways whereby the mind comes by
its ideas: only I thought it worth while to consider here, by the way,
whether the mind doth not receive its idea of active power clearer
from reflection on its own operations, than it doth from any
external sensation.
5. Will and understanding two powers in mind or spirit.
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