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Not a quote from Shakespeare. Can't say if it is really a "quote" or just a witticism that can be labeled "orig. unk."

I have also failed to find it in Shakespeare. On a totally different mission I stumbled upon this from As You Like It, Act V. Scene I. I used the first part -- "'So so' ... so so." -- for my purposes, but thought you might enjoy the second exchange where William's claim to wit is negated in a similar way to your quote.

Touch. ‘So so,' is good, very good, very excellent good: and yet it is not; it is but so so. Art thou wise? 20
Will. Ay, sir, I have a pretty wit.
Touch. Why, thou sayest well. I do now remember a saying, ‘The fool doth think he is wise, but the wise man knows himself to be a fool.'