Well, give a guy the "straight line" and just couldn't resist:
My favorite is from Admiral Rickover
“Common sense ain't common.”
― Will Rogers
“Common sense is in spite of, not the result of, education.”
― Victor Hugo
“Common sense is seeing things as they are; and doing things as they ought to be.”
― Harriet Beecher Stowe
“Common sense is as rare as genius.”
― Ralph Waldo Emerson
“The only thing a person can never have too much of is common sense.”
― Kathryn Smith, Anna and the Duke
“Nothing is more fairly distributed than common sense: no one thinks he needs more of it than he already has.”
― René Descartes, Discourse on Method
“What it takes to do a job will not be learned from management courses. It is principally a matter of experience, the proper attitude, and common sense — none of which can be taught in a classroom... Human experience shows that people, not organizations or management systems, get things done.”
― Hyman G. Rickover
“It takes centuries for sense to become common”
― Anthony Steyning
“The fifth sense is "common sense"- either you have it or you don't.”
― Jennifer Shong
“In a world of full of manipulation, half-truths and lies, the conspiracy theory is often a safer bet than the official story.”
― Gary Hopkins
“John Locke invented common sense, and only Englishmen have had it ever since!”
― Bertrand Russell
“What is common sense to one, is not always so common to another.”
― Stephan Labossiere
“Society is always taken by surprise at any new example of common sense.”
― Ralph Waldo Emerson
Common sense is the collection of prejudices acquired by age eighteen.
ALBERT EINSTEIN, as quoted in Jerry Mayer's Bite-Size Einstein