Aussie Paul. 

Hard to disagree  ...

Picked up a few relevant quotes

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An expert knows all the answers - if you ask the right questions.

Levi Strauss

An expert is a man who has made all the mistakes which can be made, in a narrow field.

Niels Bohr

And a few more (amazing what you can find on line)

Never underestimate the power of stupid people in large groups. 
 George Carlin

A stupid man's report of what a clever man says can never be accurate, because he unconsciously translates what he hears into something he can understand. 

 Bertrand Russell

It's just that it's mind-boggling to me how many people I encounter every day who are struggling to subsist on a diet of bad advice about fake solutions to nonexistent problems.

Merlin Mann

Good advice is something a man gives when he is too old to set a bad example.

Francois de La Rochefoucauld