The Believer's Relationship With The Holy Spirit

And they were filled with the Holy Spirit and began to speak with other tongues, as the Spirit gave them utterance. Acts 2:4
The Holy Spirit appeared on the day of Pentecost, accompanied by extraordinary manifestations of His presence. It is important to understand that these manifestations were "sign" oriented, not "character" oriented. The text does not say that after being filled with the Holy Spirit, they manifested great patience, kindness, gentleness, ect. (i.e. the fruit of the Spirit). Rather, it says they immediately began speaking in other tongues. May I say, that is how the unbelievers who heard them knew that something supernatural had taken place.
After the Book of Acts, the whole concept of being filled with the Spirit drops out of sight, except for one mention in Ephesians 5:18. In that passage, Paul is talking about surrendering to the influence of the Spirit, not to the indwelling ministry of the Holy Spirit. So what am I saying? Just this...we need not ask God to fill us with the Spirit, because the Holy Spirit indwells all believers in Christ. Paul wrote, "For by one Spirit we were all baptized into one body...whether Jews or Greeks, whether slaves or free...and have all been made to drink into one Spirit" (1 Cor. 12:13). The apostle John wrote, "By this we know that we abide in Him and He in us, because He has given us His Spirit" (1 John 4:13). Christian believers everywhere are filled with the Spirit.
Child of God, the presence of the Holy Spirit is a source of great assurance. In fact, "if anyone does not have the Spirit of Christ, he is not His" (Romans 8:9). We know we belong to Christ because His Spirit dwells in us. You think about that.