We receive the Holy Spirit when we accept Christ. We get more of the Spirit as we mature in Christ. The spirit guides us, convicts us of sin, and leads us to the truth.
(Ephesians 4:30 NIV) And do not grieve the Holy Spirit of God, with whom you were sealed for the day of redemption.
(Acts 2:37-38 NIV) When the people heard this, they were cut to the heart and said to Peter and the other apostles, "Brothers, what shall we do?" {38} Peter replied, "Repent and be baptized, every one of you, in the name of Jesus Christ for the forgiveness of your sins. And you will receive the gift of the Holy Spirit.