Is the truth that which I imagine to be revealed to me by some private communication? Am I to fancy that I enjoy some special Revelation and am I to order my life by voices, dreams and impressions? Brothers and Sisters, fall not into this common delusion! God’s Word to us is in Holy Scripture. All the Truth that sanctifies men is in God’s Word! Do not listen to those who cry, “Lo here!” and, “Lo there!” I am plucked by the sleeve almost every day by crazy persons and pretenders who think that they have Revelations from God. One man tells me that God has sent a message to me by him—and I reply, “No, Sir, the Lord knows where I dwell and He is so near to me that He would not need to send to me by you.” Another man announces, in God’s name, a dogma which, on the face of it, is a lie against the Holy Spirit. He says the Spirit of God told him so-and-so, but we know that the Holy Spirit never contradicts Himself. If your imaginary Revelation is not according to this Word of God, it has no weight with us! And if it is according to this Word, it is no new thing!
Brothers and Sisters, this Bible is enough if the Lord does but use it and quicken it by His Spirit in our hearts. Truth is neither your opinion, nor mine—your message, nor mine! Jesus says, “Your Word is truth.” That which sanctifies men is not only truth, but it is the particular Truth of God which is revealed in God’s Word—“Your Word is truth.” What a blessing it is that all the Truth that is necessary to sanctify us is revealed in the Word of God, so that we have not to expend our energies upon discovering the Truth of God, but may, to our far greater profit, use Revealed Truth for its Divine ends and purposes! There will be no more Revelations—no more are needed! The Canon is fixed and complete—and he that adds to it shall have added to him the plagues that are written in this Book! What need of more when here is enough for every practical purpose? “Sanctify them through Your truth: Your Word is truth.
(from: Our Lord’s Prayer for His People’s Sanctification, Sermon #1890, delivered on Lord’s Day Morning, March 7, 1866, C.H. Spurgeon)
However, I have copied this quotation from Reformed Bibliophile ( http://www.erictyoung.com/2011/02/21/a-warning-to-those-bringing-supposed-new-revelation-%E2%80%94-charles-spurgeon/)