I'll start the ball rolling with Einstein. A guy who knew a thing or two about stuff.
On Mourinho's long ball game;
“Insanity: doing the same thing over and over again and expecting different results.”
On Pep's tinkering;
“No amount of experimentation can ever prove me right; a single experiment can prove me wrong.”
and
“Anyone who has never made a mistake has never tried anything new.”
His thoughts on the over-use of stats in football;
“Information is not knowledge.”
“If you can’t explain it simply, you don’t understand it well enough.”
On Donald Trump;
“Whoever is careless with the truth in small matters cannot be trusted with important matters.”
