Common sense, in so far as it exists, is all for the bourgeoisie. Nonsense is the privilege of the aristocracy. The worries of the world are for the common people.

If one divided all of human science into two parts - the one common to all men, the other particular to the learned - the latter would be quite small in comparison with the former. But we are hardly aware of what is generally attained, because it is attained without thought and even before the age of reason; because, moreover, learning is noticed only by its differences, and as in algebraic equations, common quantities count for nothing.

Faith is believing in things when common sense tells you not to

Common sense is not so common.

Common sense is instinct. Enough of it is genius.

Common sense is the best distributed thing in the world, for everyone thinks he is so well-endowed with it that even those who are hardest to satisfy in all other matters are not in the habit of desiring more of it than they already have