[Ephesians 5:18-21 NASB] 18 And do not get drunk with wine, in which there is debauchery, but be filled with the Spirit, 19 speaking to one another in psalms and hymns and spiritual songs, singing and making melody with your hearts to the Lord; 20 always giving thanks for all things in the name of our Lord Jesus Christ to our God and Father; 21 and subject yourselves to one another in the fear of Christ.
[Colossians 3:16-17 NASB] 16 Let the word of Christ dwell in you richly in all wisdom; teaching and admonishing one another in psalms and hymns and spiritual songs, singing with grace in your hearts to the Lord. 17 Whatever you do in word or deed, do everything in the name of the Lord Jesus, giving thanks through Him to God the Father.
John MacArthur argues from the similarities and parallelism between Ephesians 5:18 and Colossians 3:16 that "being filled with the Spirit" and "letting the Word of Christ dwell richly in oneself" are identical, i.e., that they are different expressions used to refer to the same phenomenon:
Now, in our last study, we learned that being filled with the Spirit, as it indicates in verse 18, is living every moment as if you’re standing in the presence of Jesus Christ. As we compared Ephesians 5:18 with Colossians 3:16, we noted that letting the Word of Christ dwell in you richly is the same as being filled with the Spirit. We saw from the illustration of the life of Peter that Peter, when he was standing next to Jesus Christ, could do the miraculous, say the miraculous, and had miraculous courage. The same Peter, when filled with the Spirit of God, is seen doing the miraculous, heard saying the miraculous, and seen to have miraculous courage. In other words, the parallel is interesting. When he was near Jesus Christ, in His presence, and when he was filled with the Spirit of God, he got the same kind of results. And see, that is exactly what Ephesians 5:18 and Colossians 3:16 is saying to us. To be filled with the Spirit is not some ecstatic experience. It is not to have some supernatural zap. To be filled with the Spirit is simply to live moment by moment in the conscious presence of Jesus Christ.
This answer makes a similar argument:
Both phrases, 'be filled with the Spirit' and 'let the word of Christ dwell in you richly' are present active imperatives; they are constant commands to us in the now which, when obeyed, are expected to bring forth songs of praise, a thankful heart toward God in Christ's name, unity in the body, and order in the Christian household.
As one of the indwelling Holy Spirit's primary roles is to bring to our remembrance everything that He has said (John 14:26), it is likely that there is at least a strong correlation if not a sameness between being filled with the Spirit and being richly indwelt with the word of Christ.
This is not to say that mere intellectual Bible knowledge is enough. There is a deep reception of the Word which is in view; a reception that causes radical and fundamental worldview change and which introduces into a person something that they did not previously possess; the power to become sons of God.
I understand the temptation to infer a functional identity between "being filled with the Spirit" and "the Word of Christ dwelling richly" based on the structural similarities between the two passages. However, we must also consider that "being filled with the Spirit" and similar expressions appear in numerous other contexts, such as:
- Old Testament: Exodus 31:3, 35:31; Deuteronomy 34:9; Micah 3:8
- Gospels & Acts: Luke 1:15, 1:41, 1:67, 4:1; Acts 2:4, 4:8, 4:31, 6:3, 6:5, 7:55, 9:17, 11:24, 13:9, 13:52
- Epistles: Ephesians 5:18
The breadth of these occurrences should, at the very least, add necessary nuance to any attempt to equate the two concepts entirely. For instance, how can the "identity interpretation" advanced by John MacArthur be reconciled with the specific manifestations found in Acts 2:4 and Acts 4:31, or in Luke 1:41 and Luke 1:67?
In short: are "being filled with the Spirit" (Ephesians 5:18) and "letting the Word of Christ dwell richly in oneself" (Colossians 3:16) truly synonymous?