In order to be able to expound the Scriptures, and as an aid to your pulpit studies, you will need to be familiar with the commentators: a glorious army, let me tell you, whose acquaintance will be your delight and profit. Of course, you are not such wiseacres as to think or say that you can expound Scripture without assistance from the works of divines and learned men who have laboured before you in the field of exposition. If you are of that opinion, pray remain so, for you are not worth the trouble of conversion, and like a little coterie who think with you, would resent the attempt as an insult to your infallibility. It seems odd, that certain men who talk so much of what the Holy Spirit reveals to themselves, should think so little of what he has revealed to others. My chat this afternoon is not for these great originals, but for you who are content to learn of holy men, taught of God, and mighty in the Scriptures. It has been the fashion of late years to speak against the use of commentaries. If there were any fear that the expositions of Matthew Henry, Gill, Scott, and others, would be exalted into Christian Targums, we would join the chorus of objectors, but the existence or approach of such a danger we do not suspect. The temptations of our times lie rather in empty pretensions to novelty of sentiment, than in a slavish following of accepted guides. A respectable acquaintance with the opinions of the giants of the past, might have saved many an erratic thinker from wild interpretations and outrageous inferences. Usually, we have found the despisers of commentaries to be men who have no sort of acquaintance with them; in their case, it is the opposite of familiarity which has bred contempt.

http://www.spurgeon.org/misc/c&cl1.htm