Maxims of Ptahhotep spoke a lot of sense; ‘Do not be arrogant because of your knowledge, but confer with the ignorant man as with the learned. Good speech is more hidden than malachite, yet it is found in the possession of women slaves at the millstones.’ Now THAT I’ll give the green light to. The opinions, eloquence and articulacy of the man or woman on the street can often be as invaluable as precious stones.