the righteousness based on faith says, “Do not say in your heart, ‘Who will ascend into heaven?’” (that is, to bring Christ down) “or ‘Who will descend into the abyss?’” (that is, to bring Christ up from the dead). But what does it say? “The word is near you, in your mouth and in your heart” (that is, the word of faith that we proclaim)...Jesus is Lord
(Romans 10:6-9)
Paul is arguing that by faith we find Christ present in the preached word we hear from our pastors, evangelists and missionaries. So Christ is not a distant goal to be attained to, or in the first instance somebody who has walked the way of the perfect life for you to follow, instead he is here for us to confess and call upon and be saved. If we have a preacher, Christ is never distant, but in our hearts, and because he cannot be contained we find him overflowing our hearts through our mouths.
Paul used Deuteronomy 30 "the word is near you," just this way. Moses' original use of this word concerned the law, and he thought it meant there was no longer any need to go find the law in a voyage over the sea or going down to the depths since now it had come near in the tablets of stone. But for Paul [...] "up" and "down" describe Christ's ascent into heaven and descent into hell. this is the crucial matter of the presence of Christ around which all of Lutheran theology circulates. Descent into hell is legally inappropriate for the infinite God, and ascent into heaven is impossible for a finite man. The communication of attributes nevertheless accomplished both at once. Christ's ascent into heaven is normally taken as "escape" or absence, consequently whenever Christ's presence is considered following his "humiliation" (as theology calls Christ's descent) and his "exaltation" (to the right hand of the Father) it is spiritualized in a pagan sense. Christ's body is removed from his presence, and more importantly, God himself is removed from the word that is preached... Where is Christ now?... where Moses law once was: "the word is near you... that is, the word we preach" (Romans 10:8)
(pp. 226-227, Steven Paulson, Lutheran Theology)
For more on the preached word try Glen Scrivener's seminars.