If there is any wisdom in this theory, it is so profound that we "don't
see it." It looks very much to us as though this amounted only to the
saying that "all we know about the mystery is, that it is _unknown_; all
the explanation that we can give of it is, that it is inexplicable; and
that the only theory of it is, that it has no theory." Thus it leaves
the matter just where it was before, and we should not have deemed this
saying worthy of the slightest notice had we not heard and read so much
grave discussion on the subject, criticising almost every other theory,
and then concluding with the complacent announcement of the writer's or
speaker's theory as superior to all others, that "_it is some principle
or force of nature as yet unknown_!"