How can God be constantly three persons at the same time?
The doctrine of the Trinity is absolutely essential to New Testament Christianity.
Before we answer this question, we have to first establish the deity of both Jesus and the Holy Spirit.
Theologians have pointed out that if the deity of Christ and the Holy Spirit were not real, then the Bible and the Christian faith would be unreliable.
If Christ was not divine, then His death on the cross would not have been able to atone for all our sins and would have merely been the death of a martyr.
If the Holy Spirit was not divine, then the followers of Jesus would have never had the power to spread the Gospel and to witness to people the way they did.
Therefore, it is essential that the persons of Jesus and the Holy Spirit are divine.
Secondly, God does not change into different roles or forms.
As Christians understand God, He does not decide to be like Father one day, like a Son another day, and like a Spirit the next.
He does not change roles or forms.
Instead, God is always one in essence that is shared by three independent “persons” who each have a unique will and personality, and each is equally God. Christian teaching asserts that the Father is fully God, Jesus is fully God, and the Holy Spirit is fully God.
Lastly, by looking at some of the essential beliefs of the Christian faith, we can see how the three persons of the Godhead are aligned together in one essence.
(1) Salvation:
we are chosen by the Father, purified by the Spirit and covered with the blood of Jesus.
1 Peter 1:2 (NIV)
who have been chosen according to the foreknowledge of God the Father, through the sanctifying work of the Spirit, to be obedient to Jesus Christ and sprinkled with his blood:
(2) Sanctification / Being made Holy
2 Corinthians 13:14 (NIV)
May the grace of the Lord Jesus Christ, and the love of God, and the fellowship of the Holy Spirit be with you all.
(3) Christian Baptism: we are baptized in one name, yet three Persons:
Matthew 28:19 (NIV)
Therefore go and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit,
(4) Christian Growth:
we are chosen by God, loved by the Lord Jesus, and sanctified by the Spirit.
2 Thessalonians 2:13 (NIV)
But we ought always to thank God for you, brothers and sisters loved by the Lord, because God chose you as first fruits to be saved through the sanctifying work of the Spirit and through belief in the truth.
Theologians have pointed out that if the deity of Christ and Holy Spirit were not real, then the Bible and the Christian faith would be unreliable.
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