I am working on material for the next Theology House Lenten Studies book, Risk: Through Lent with Acts (January, 2017). In Acts 20:32, Paul farewelling the Ephesian elders says,
"And now I commend you to God and to the message of his grace."
A first thought is that commending someone to God's grace is sufficient so the additional "and to the message of his grace" is unexpected. Why?
An implication is that God chooses both to work in the believer through his indwelling Spirit and also through the medium of his Word, the message of his grace, the gospel.
God can and does build us up through the Spirit working within each believer but also through the medium of the Word.
This message of grace, Paul continues in Acts 20:32, is
"a message that is able to build you up and to give you the inheritance among all who are sanctified."
In the particular context of Paul's warning of savage wolves threatening to tear the flock of God apart in Ephesus, he is saying that a critical factor in preventing the savagery is attention to the message of God's grace.
This is an always pertinent message to the church in every era and every place.
In terms of some currents in the church today, it is also a message which reminds us that the power to nurture the soul does not lie solely in the "ministry of the Sacrament." Vital to Christian growth, steadfastness and liveliness is the "ministry of the Word."