The notion that the Spirit gives the power of speech to the apostles and to the Christian martyrs also leads in time to the notion that the Spirit is a third individual, similar to the Word. In the second and third century, Christian theologians make the Spirit subordinate to Son as well as Father, thus preserving the unity of the divine through hierarchy. Thus prayer is to the Father, through the Son, and in the Holy Spirit. Father in God in the full sense. Son and Spirit are derivative and extensions of God's power, but are beings in the divine realm.
Monotheism is preserved by subordination and origin.
The most important thing is that there is a single being who has all control over the universe and thus insures its cohesion and unity. Modalism or Sabellianism was one of the options for understanding the relation of the three individuals to which the Christian practice referred was as three manifestations of a single individual-that the one God is apparent as creator, savior and sanctifier. The difficulty with this was that Jesus is regularly presented in the Gospels as talking to the Father and about the Spirit as distinct individuals. Modalism was generally rejected. Logos theology provides an explanation of the relation between the God and the Word.