Pentecost means the descent of the Holy Spirit from the Father to His followers and believers on earth, and that is what today represents. And we modern day Christians need to keep the Holy Spirit within us to support us, refresh us, and lead us always on the path to righteousness. Like those brave souls of earlier times, we need to have courage and be Apostles for Jesus Christ in the 21st century.
Oh yes, we are sinners and there is no escaping that, but through Jesus Christ we can escape the bonds of sin and become one with Him in a greater life to come. And it costs you no dollar amount; your redemption has been paid for by the blood and body of Christ on the Cross. All that is required is that you believe in Him and follow Him. Could there be any greater love than that?
Rejoice, accept the gift of the Holy Spirit and its promise of Eternal Life. Commit yourself to Him forever more. The fruits of this will be joy and love beyond your greatest imagination.
And Peter said to them, "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." Acts 2:38 (ESV)