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Everything is and is not, as in the old riddle-'A man and not a

man shot and did not shoot a bird and not a bird with a stone and

not a stone.' The mind cannot be fixed on either alternative; and

these ambiguous, intermediate, erring, half-lighted objects,

which have a disorderly movement in the region between being and

not-being, are the proper matter of opinion, as the immutable

objects are the proper matter of knowledge. And he who grovels in

the world of sense, and has only this uncertain perception of

things, is not a philosopher, but a lover of opinion only...