God the Father (Abba) is the fountainhead (source) of the Holy Trinity, and the maker of heaven and earth, and of all things visible and invisible.
God the Father created all things through the Son, in the Holy Spirit, and Christians are called to worship Him. The Father loves us and sent His Son to give us everlasting life (John 3:16).
In the Old Testament the intimate name of Father was not used to address God in prayer. Only in Christ and because of Christ can Christians have such boldness. Only Christians can properly say the Lord's Prayer that was taught to them by the Son of God. Only those who have died and risen with Christ in baptism are enabled to approach the Almighty God most high as their Father (John 1:12; Matthew 6:9; Romans 8:14; Galatians 4:4).