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You have to have the common sense.

Common sense is the genius of humanity.

I never got a formal education. So my intellect is my common sense. I don't have anything else going for me. And my common sense opens the door to instinct.

Common sense is very uncommon.

Common sense to one person might be something different to another.

Common sense is the knack of seeing things as they are, and doing things as they ought to be done.

Common sense is judgment without reflection, shared by an entire class, an entire nation, or the entire human race.

Common sense is instinct, and enough of it is genius.

Common sense in an uncommon degree is what the world calls wisdom.