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Now to sift all the opinions would be perhaps rather a fruitless

task; so it shall suffice to sift those which are most generally

current, or are thought to have some reason in them.

And here we must not forget the difference between reasoning from

principles, and reasoning to principles: for with good cause did

Plato too doubt about this, and enquire whether the right road is

from principles or to principles, just as in the racecourse from

the judges to the further end, or vice versa.