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1 Corinthians 2:16 (New International Version 1984, ©1984)

 16 “For who has known the mind of the Lord
   that he may instruct him?”

   But we have the mind of Christ.

From BibleGateway.com: http://www.biblegateway.com/passage/?search=1 Corinthians 2:16&version=NIV1984