While many Christians are accustomed to praying to the Father and to the Son, they are not as familiar or comfortable with praying to the Holy Spirit. The Spirit can seem very elusive, but he doesn’t need to be. The Holy Spirit is as accessible to us as the Father and the Son and Christians should readily turn to him in prayer and supplication.
There are many ways in which we can call upon the Holy Spirit. When we pray to him, we pray to the Holy Trinity since he is never separated or removed from the Father and the Son.