After a person has accepted the Lord we say he not only is Saved but also has been Regenerated.
This means that this man is now Born of God.
He has Received a New Life from Him.
Having the Life of God, a person is not only, negatively speaking, aware of sins but he also, positively speaking, Knows God; for what we Receive is NOT the spirit of a bond-slave but the Spirit of Sonship.
We just naturally feel that God is very approachable and that calling Him Abba, Father is most sweet.
The Spirit himself bears witness with our spirit that we are children of God, ROMANS 8:16
Knowing God as Father is therefore the inner consciousness of this Life.