"No investigation no right to speak"

Everyone engaged in practical work must investigate conditions at the lower levels. Such investigation is especially necessary for those who know theory but do not know the actual conditions, for otherwise they will not be able to link theory with practice. Although my assertion, "No investigation no right to speak", has been ridiculed as "narrow empiricism", to this day I do not regret having made it; far from regretting it, I still insist that without investigation there cannot possibly be ...