When you receive the Holy Spirit you receive power (Acts 1), and without His power it is impossible to preach with boldness, heal people, cast out demons, raise the dead, prophesy and live the life we are called to live. Not even Jesus could do miracles before the Holy Spirit settled on Him. Even though He was Jesus the Son of God, He still needed the power of the Holy Spirit to do the miracles He did. We need to realise that and get to know Him personally.