The Bible teaches that born-again believers are the most privileged people in all the world. No other people in world history have ever had the spiritual options that we have. Old Testament believers were "endued" or visited by the Holy Spirit. He would rest upon people at specific times for a purpose, but only a selected few would actually experience the power of the Holy Spirit within.
Today, every born-again believer has been purchased by the precious blood of the Lamb, Jesus Christ. The moment a person is saved, he is filled with the Holy Spirit. When we sin, we quench and can even grieve the Holy Spirit; therefore we must judge our sin on Calvary to experience the filling of the Spirit again. We must repent and use recovery in purity.
The Holy Spirit will never be taken away from us. He indwells us forever. God has given us a mandate to be filled with the Holy Spirit, to be set apart by categorical doctrine, and to study to show ourselves approved, "workmen who need not be ashamed, rightly dividing the Word of truth." We can let the Word of God dwell richly in our hearts, and the Word will produce a melody of psalms, hymns, and spiritual songs that we sing with grace in our hearts to the Lord.