“be filled with the Spirit” (Ephesians 5:18) is to be controlled by the Holy Spirit. This is a present continuous action and requires a believer to be (a) daily yielded to God, (b) daily in repentance with confession with godly sorrow, (c) daily allowing the word of God to richly indwell the inner man. Being controlled by the Holy Spirit empowers a believer (a) daily in spiritual battle (Spirit versus flesh) and, (b) daily in living out the person and character and conduct of Christ and in being obedient to the will of God.
Holy Spirit: Pentecost and Spiritual Gifts
The outpouring of the Holy Spirit occurred at Pentecost. The power of the Holy Spirit in union with the spoken word of the gospel of salvation resulted in the addition of 3000 souls and the beginning of the church at Pentecost. Each individual believer indwelt by the Holy Spirit is given at least one spiritual gift according to the grace of God for the purpose of (a) equipping of believers for serving fellow believers, (b) building up the body of Christ and, (c) glorifying God. Each believer is tasked of being a steward or manager of their spiritual gift/s; the expression of their gift being in love.