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And this is life eternal, that they might know thee the only true God, and Jesus Christ, whom thou hast sent. -

Eternal Life is a gift. That gift is the Holy Spirit whereby we are made One with the Lord Jesus Christ.

It is in the Holy Spirit and the written Word that we fellowship and come to know our Creator, our Saviour.

Eternal Life is the gift of the Holy Spirit, the Spirit Of Christ, by receiving Jesus as Lord and Saviour.

Abundant Life is experienced as we walk in Eternal Life - our relationship with Him which transforms us.

For the wages of sin is death; but the gift of God is eternal life through Jesus Christ our Lord. -

The sin that condemns to the Lake Of Fire is rejection of Jesus Christ.
The gift of the Lord is Eternal Life: remission of sins, regeneration and Spirit Baptism.

We all know that there is physical death and spiritual death. Adam and Eve did not physically die when they sinned. However, they spiritually died immediately.

When a person sins, whether believer or unbeliever, the result is an aspect of death. Somethings shrinks or shrivels instead of growing when sin occurs.

God gives us Eternal Life when we believe on the Lord Jesus Christ. That gift is irrevokable. However, if we let sin reign in our mortal bodies we will suffer the consequences of that sin which will destroy our physical lives, our testimonies and our walk with the Lord.

Instead of us living a victorious, productive life with treasure laid up in heaven, we will be saved as by fire.

So, salvation ( Eternal Life) is a gift.
The way we receive the gift is this:
That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved. -
This is the encapsulation of Grace, clearly pointing out our part which is faith in Jesus and confession of Him as risen Lord and Saviour.
The implication of our part being to believe on Jesus Christ and confess Him as risen Lord, is that He has done everything else!
It is why we call it amazing Grace!
It is why the gospel is nearly too good to be true!
Who raised Jesus from the dead?     The Holy Spirit.
The Spirit of Christ Jesus raised His body.

For with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation. -
It is Heart Faith that enables the miracle of the New Birth.
It is our personal confession of Jesus as mighty Creator and loving Saviour that seals that miracle.

The key words in this passage are Jesus, confess, believe, and heart. The one which is most overlooked is heart.
Heart Faith in the risen Christ produces salvation, not Head Faith.