I found this quote at The PBC website in an article called The Divine Wind by Ray C. Stedman. It does not give a source as to where in Spurgeon's works he got the quote from, but sounds like the one you are looking for.
"Charles Spurgeon, the great English preacher, used to say, "I never could understand why some men set such great value on what the Holy Spirit said to them, and so little value on what he said to anyone else." This is what these people are implying: that only what God says to them counts -- as though he were not speaking to anyone else. But, you see, God has made the Scriptures, and he has also provided teachers who are gifted and helpful in understanding and explaining them. It takes both to enter into the full knowledge of truth."
http://www.pbc.org/library/files/html/0425.html 
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