As prayer will not be truly prayer without the Spirit of God, so it will not be prevailing prayer without the Son of God. He, the Great High Priest, must go within the veil for us; nay, through his crucified person the veil must be entirely taken away; for, until then, we are shut out from the living God. The man who, despite the teaching of Scripture, tries to pray without a Savior insults the Deity; and he who imagines that his own natural desires, coming up before God, unsprinkled with the precious blood, will be an acceptable sacrifice before God, makes a mistake; he has not brought an offering that God can accept, any more than if he had struck off a dog’s neck, or offered an unclean sacrifice. Wrought in us by the Spirit, presented for us by the Christ of God, prayer becomes power before the Most High, but not else.
From a sermon by Charles Haddon Spurgeon entitled "The Throne Of Grace," delivered November 19, 1871. Image by H Matthew Howarth under Creative Commons License.