albert,

the translation for which you asked: nothing is knowable. mousie uses this line, variously couched, when the inadequacies of empirical practice are pointed out. when, on the other hand, he is characterizing clinical practice as empirically unreliable, he seems to forget these provisos, demanding instead that we (clinicians) submit to his (now somehow infallible) empirical protocols.

__________________
"The need to perform adjustments for covariates...weakens the findings." BMJ Clinical Evidence: Mental Health, (No. 11), p. 95.... It's that simple, guys: bad numbers make bad science.