But when the goodness of God and His love
for mankind appeared,
He saved us —
not by works of righteousness that we had done,
but according to His mercy,
through the washing of regeneration
and renewal by the Holy Spirit.
He poured out this Spirit on us abundantly
through Jesus Christ our Savior,
so that having been justified by His grace,
we may become heirs with the hope of eternal life.
Here is a great and full reference to the classic Christian doctrine of the Trinity. God the Father, Son and Holy Spirit are all fully described in this highlighted passage. You can also find clear Biblical reference to the Divine Trinity in Ephesians 2:18 and 2 Corinthians 13:13. No other faith system or world religion describes God in such terms. It is critical to our understanding of exactly who God is and how He works in our world, in our lives and in His church.
It seems no coincidence that in this Trinitarian passage the true plan of salvation is laid out clearly. Salvation by grace through faith alone. Regeneration by the indwelling Holy Spirit who has been poured out upon the justified by Father God. Not by works of righteousness but through the faithfulness of the only Righteous One.