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true. But this is far too severe. For never yet
has any man attained to an apprehension
perfectly clear and distinct, let alone
its being adequate; and yet I suppose
that true ideas have been entertained.
Ordinary ideas of perception, which
Descartes thought were most horribly
confused, have nevertheless something
in them that very nearly warrants their
truth, if it does not quite so. “Seeing is
believing,” says the instinct of man.

The question is what theories and conceptions we ought to
entertain. Now the word “ought” has no
meaning except relatively to an end.
That ought to be done which is conducive