"15 Look carefully then how you walk, not as unwise but as wise, 16 making the best use of the time, because the days are evil. 17 Therefore do not be foolish, but understand what the will of the Lord is. 18 And do not get drunk with wine, for that is debauchery, but be filled with the Spirit, 19 addressing one another in psalms and hymns and spiritual songs, singing and making melody to the Lord with your heart, 20 giving thanks always and for everything to God the Father in the name of our Lord Jesus Christ, 21 submitting to one another out of reverence for Christ."
Ephesians 5:15-21
It should be noted that there is a parallel passage to this one in Colossians 3:16-17 (which see). Clearly, Paul is saying the same kind of thing in Colossians as here, the difference being that the same 'heart exercise' that is attributed to the Spirit in Ephesians 5 is attributed to the Word in Colossians 3: 'Speaking to yourselves in psalms and hymns and spiritual songs…. 'It is surely evident that the Word and the Spirit stand in conjunction here, with the rich indwelling of the Word and the fullness of the Spirit closely linked together. This surely indicates that the life in the Spirit and living on the Word belong together and that the fullness of the Spirit is a fullness associated with the Word of God, and never divorced from it. This may be a real indication and pointer as to how to be filled with the Spirit in the way Paul means: it is to be diligent in the Word. It is when hearts brood on the Word, drinking in its teaching, until they glow within, that they are filled with the Spirit. It could be put this way: here is a man who is captive to the Word of God; in that Word he sees a great and glorious Christ and he forms the conviction that Christ is a mighty and all-sufficient Saviour, and he is thrilled and overcome with the sheer wonder of it all. Now, when he is there, there is the fullness of the Spirit, for the Spirit's work and delight is to take of the things that are Christ's and show them to us. And the evidence of the Spirit's indwelling and fullness is, not that we are conscious of the Spirit's fullness, but that we are conscious of Christ. This is the real mark of the divine infilling - to be conscious more and more of the greatness of the Saviour, to realise that we owe Him - and gladly give Him - the worship, homage and obedience of our hearts. This is the biblical evidence that the Spirit of God is having His way in our lives: And when he is, the language that He makes us speak is - not 'I am filled with the Holy Spirit' but 'To me to live is Christ, and to die is gain', and 'This one thing I do ... l press on towards the mark, for the prize of the high calling of God in Christ Jesus', 'None of these things moves me, neither count I my life dear unto myself, so that I might finish my course with joy, and the ministry, which I have received of the Lord Jesus Christ, to testify the gospel of the grace of God'.