"Common sense is not really so common. The Art of Thinking: Port-Royal Logic"

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I read, I study, I examine, I listen, I reflect, and out of all of this I try to form an idea into which I put as much common sense as I can. I shall not speak much for fear of saying foolish things; I will risk still less for fear of doing them, for I am not disposed to abuse the confidence which they have deigned to show me. Such is the conduct which until now I have followed and will follow.

— Marquis de Lafayette