G. E. Moore,
Philosophical Studies
“ New evidence may be discovered or men may learn to make a better use of evidence already in existence. But is it certain that this will always happen? Is it certain that every question, about which historians have doubted, will some day be able to be settled by verification of one or the other hypothesis? Surely the probability is that in the case of an immense number of events, with regard to which we should like to know whether they happened or not, it never will be possible for any man to verify either the one hypothesis or the other. ”
