A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools.

Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense.

But who prays for Satan? Who, in eighteen centuries, has had the common humanity to pray for the one sinner that needed it most?

Common looking people are the best in the world: that is the reason the Lord makes so many of them.

Common sense is in spite of, not as the result of education.

Common sense is not so common.

Common sense is the collection of prejudices acquired by age eighteen.

Common sense is the most widely shared commodity in the world, for every man is convinced that he is well supplied with it.

For it is commonly said: accomplished labours are pleasant.

Grief and sadness knits two hearts in closer bonds that happiness ever can; and common sufferings are far stronger than common joys.

Heterosexuality is not normal, it's just common.

New opinions are always suspected, and usually opposed, without any other reason but because they are not common.

One of the most common causes of failure is the habit of quitting when one is overtaken by temporary defeat.

Outstanding people have one thing in common: an absolute sense of mission

Religion is excellent stuff for keeping common people quiet. Religion is what keeps the poor from murdering the rich.

The superior man thinks only of virtue; the common man thinks only of comfort.

The three things that are most essential to achievement are common sense, hard work and stick-to-it-iv-nes

There is nothing more uncommon than common sense.

There is one common struggle against those who have appropriated the earth, the money, and the machines.

True friends ... face in the same direction, toward common projects, interests, goals.