Your search for "Advertising is the very essence of democracy. - Anton Chekhov 1860 - 1904" revealed the following:

RW-6.8 - Knowledge is of no value unless you put it into practice. - Anton Chekhov 1860 - 1904

PWK-6.8-Knowledge is of no value unless you put it into practice. - Anton Chekhov 1860 - 1904

PWB-6.8- Knowledge is of no value unless you put it into practice. - Anton Chekhov 1860 - 1904

YT-6.8- Knowledge is of no value unless you put it into practice. - Anton Chekhov 1860 - 1904