The Holy Trinity is an extremely important yet mystical doctrine of the Christian faith. It defines ‘the only one God’ in three aspects, that is, the Father, the Son, and the Holy Spirit.
The Father refers to God the Father (Almighty), the Son refers to Jesus Christ, and the Holy Spirit is the Spirit of the Lord that exists all through eternity.
According to the Trinitarian theology, God the Father is considered the eternal source of Godhead. Hence, He is considered the “origin” or “source” of the Son of god and the Holy Spirit, too.