What is this conversation? The word means the whole of your walk before God and before man. It is a very comprehensive term in the original, meaning, literally, "Conduct yourselves as citizens." It therefore includes the whole of our spiritual fellowship and daily intercourse with God and man. It thus views us as citizens of no mean city; as citizens, I may indeed say, of a heavenly city, the new Jerusalem; and it bids us walk and speak, live and act, as becometh citizens of a heavenly country.
This, then, is the meaning of the word "conversation" in our text, and by it we are called to walk with God as becometh the gospel. He has reconciled us to himself by the blood of his dear Son; and when we receive the atonement, or reconciliation, as the word means, then we can walk with God in peace, equity, and amity, for sin, which made the breach, is removed out of the way.
So Levi, as ministering at the altar, and those near to God, walked of old. "My covenant was with him of life and peace; and I gave them to him for the fear wherewith he feared me, and was afraid before my name. The law of truth was in his mouth, and iniquity was not found in his lips: he walked with me in peace and equity, and did turn many away from iniquity" (Malachi 2:5, 6). This is walking in the light as He is in the light, and so far as we can do this, our fellowship is with the Father (1 John 1:3-7).
And our conversation with God, our walk with God, must be as becometh the gospel of Christ. If we walk at freedom with God, in sweet liberty, with holy access, pouring out our heart before him, enjoying his presence, and having some discoveries of his goodness and mercy, then our conversation with God becometh the gospel. The gospel is a message of mercy. When, then, we embrace that mercy, and feel the power of it; when that mercy reaches our heart, melts our inmost soul, dissolves our doubts and fears, and removes legality and bondage, then we walk worthy of the gospel, as walking before God in the light of his countenance through the power of the gospel. God does not send the gospel to condemn us, for "there is no condemnation to them which are in Christ Jesus, who walk not after the flesh, but after the Spirit;" and they walk after the Spirit when they have access by him through Christ unto the Father.