Read Acts 19:1-7.
Upon arriving at Ephesus, Paul asked some believers if they had received the Holy Spirit. When they informed him they had not heard of the Holy Spirit, Paul asked what baptism they had received. They responded “John’s baptism.” They were baptized in the name of Jesus. When Paul placed hands on them they received the Holy Spirit. Then they spoke in tongues and prophesied.
While we may have many questions about these things, it is clear that the Presence of the Spirit will be manifested in some ways. What is the evidence in your life that the Holy Spirit is filling you? How can you open yourself to the Spirit today?