and the trouble there is I am not a historian (neither are you) and I follow what Dear Google tells me.in terms of sources of quotes..unfortunately the same sites conflict themselves — Goodreads puts that quote as an arabic quote but also here puts it as a quote by Confucius, who only by a 100 yrs predated Scorates..thats the thing abt wisdom..we all have the same thoughts put in different words — https://www.goodreads.com/quotes/417259-he-who-knows-and-knows-that-he-knows-is-a