The filling of the Holy Spirit is what enables believers to do many things for Christ, including speaking God's word with boldness. The apostles, like Peter and the disciples, prayed for boldness to preach the gospel, and God answered their prayers by giving them the courage to speak His word. The Holy Spirit is a permanent arrangement in the lives of believers, and it is what empowers them to serve God's people, verify God's work, and counter-attack God's enemy.
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