However, it is only when we appropriate the Grace of God through faith in Christ Jesus that the Sin Nature is effectively crucified with Christ and we experience the New Birth.   

In the New Birth we experience Spirit Salvation - the death of the old Sin Nature spirit and the birth of the New Creature by the Holy Spirit.   

So, at the New Birth we experience eternal Spirit Salvation.   We are perfect in the Spirit birth and will always be so.   This is true because we are born of the Holy Spirit of God.   

For G1063 the wages G3800 of sin G266 [is] death G2288 ; but G1161 the gift G5486 of God G2316 [is] eternal G166 life G2222 through G1722 Jesus G2424 Christ G5547 our G2257 Lord G2962 . Rom 6:23 The sin that condemns to the Lake Of Fire is rejection of Jesus Christ Joh 3:18.      The gift of the Lord Jesus is His own Eternal Life, which is relationship with His Holy Spirit Joh 5:26.      There are two types of death:    → physical death Heb 9:27    → spiritual death Rev 21:8.      Adam and Eve did not immediately die physically when they sinned.     However, they immediately died spiritually Gen 2:17.      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 Joh 10:10.      Jesus gives us His life - Eternal Life when we believe on Him.     That gift is irrevokable Joh 14:16.      However, if we let sin reign in our mortal bodies we will suffer the consequences of that sin destroying our physical lives, our testimonies and our walk with the Lord Col 1:10.      Instead of us living a victorious, productive life with treasure laid up in heaven, we will be saved as by fire 1Cor 5:5.

So, we Receive the Gift of God, Eternal Life, and we are eternally secure.   We have been sealed with the Holy Spirit.   Spirit Salvation is for all eternity and it is instantaneous.   

The Spirit Salvation being a Spirit level birth is known only in the Spirit Realm.   It cannot be seen in the Physical Realm.   

This is why Soul Salvation is necessary.   Unless we allow the New Creature to manifest in the flesh, the world receives no witness as to what has happened in the New Birth.   

Without Soul Salvation there is no physical evidence of Spirit Salvation.   

Herein lies the problem with people judging each other.   They attempt to measure that which is spiritual with physical measures.   This is inaccurate at best.   

Yes, Jesus said you will know them by their fruit.   But he was talking about mature trees as only mature trees bear fruit.   

When mature Christians do not see fruit in young (and ignorant) Christians they doubt their conversion.   This is a major error - judging the spiritual by the physical.   

Though it may seem that I am minimizing the importance of Soul Salvation I am not.   I am simply trying to correct the error of judging a tree prematurely.   

For G1063 we are G2070 G5748 his G846 workmanship G4161 , created G2936 G5685 in G1722 Christ G5547 Jesus G2424 unto G1909 good G18 works G2041 , which G3739 God G2316 hath before ordained G4282 G5656 that G2443 we should walk G4043 G5661 in G1722 them G846 .(ordained: or, prepared) Eph 2:10 The Lord's plan was ordained or decreed, and a big part of that plan is that all men come to repentance, receive Christ Jesus and be born by the Holy Spirit as His children.     But that hasn't happened because of Free Will.      Our part is to willingly and freely receive Him and so be part of His Plan.      Even after being Born Again as New Spirit beings we must, in our soul (mind and emotions), willingly and purposely abstain from sin, spend time in the Word and pray in the Holy Spirit so that we be transformed by the Renewing of our minds.      So, we walk in good works only when and to the extent that we are led by the Holy Spirit.

Christ Jesus must perform the work on us in order for us to mature to Soul Salvation.   This requires studying the Word and fellowship in the Holy Spirit.   It requires Spiritual Revelation into the knowledge of Christ.   

When we understand the Truth and receive it into our hearts there is a transformation which takes place in our soul.   Our mind is renewed.   The end result is that we have the Mind Of Christ.