In John's Gospel account of Jesus and the coming of the Christ --to be 'God With us' and then God in us following the Resurrection and Church Day of Pentecost,-- in that Gospel we are given the scene of one Nicodemus, member of the Jewish Sanhedrin in that day, coming to Jesus at night to ask Him for something to show He was Messiah. They get into an exchange during which Jesus tells Nicodemus that a man must be born again, born of the Spirit, in order to enter into Heaven.

Throughout the letters of Paul --and especially in the letter to the Romans-- Paul addresses this notion of being born again, born of the Spirit, for Salvation in Christ. And he, Paul, explains it using the verb tenses and cases in the Greek which indicate an immediate deliverance followed by an ongoing transformational process called ‘sanctification’.
 The Blood of Christ cleansed the Mercy Seat in Heaven and thereby those who died before the Cross were made righteous because of their belief (‘faithe‘) in God’s Promises.
 The Blood of Christ cleanses your heart allowing God’s Spirit to come into your inner self, your spirit, and dwell there to transform your soul as you ‘faithe’ in the promises of God to transform you, thereby ‘establishing’ the Law of God (fulfilling the Law) in your heart, as Paul put it.
When one reads these passages in the Greek, there are certain specific aspects of the Greek words which give insight into the specifics of the written passages. Here's a simplified example from Romans chapter ten:
Romans 10:8-10 But what saith it? The word is nigh thee, [even] in thy mouth, and in thy heart: that is, the word of faith, which we preach; 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. For with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation. (KJV)
Romans 10:8-10 10:8 But what doth it say? `Nigh thee is the saying -- in thy mouth, and in thy heart:` that is, the saying of the faith, that we preach; that if thou mayest confess with thy mouth the Lord Jesus, and mayest believe in thy heart that God did raise him out of the dead, thou shalt be saved, for with the heart doth believe to righteousness, and with the mouth is confession made to salvation; (Young’s Literal Translation)
The underlined words --faith, believe, and believeth-- all derive from the Greek word ‘pisteuo’. In the Greek the verbs give rise to the nouns, so ‘pisteuo’ --to faithe-- gives rise to ‘pistis’, the noun --faith. Important to the understanding of the use of ‘pistis’ is that it is at its heart an action word which, in the way written in the passage, is an ongoing action, an immediate application with continuous force, an unending application --not continuous if referred back to, but a thing instituted by God not man, then remaining in effect WHILE the ‘faither’ lives the remainder of life ‘faithing’.
 Faith is action based upon belief sustained by the confidence that what God promises He will do. That is why we read repeatedly that Abraham ‘believed’ God and it was counted for him righteousness. … The words in blue --confess and confession (’homologeo‘)-- are derived from ‘homos’ which is Greek for ‘at the same place or time’; adding ‘logeo‘ we have ‘at the same time or place spoken‘. … The word in red --salvation (soteria=deliverance)-- is derived from the Greek word ‘soter’, meaning ‘a deliverer’.
It has been offered at FreeRepublic that ’Salvation is a thing that is worked out on one’s knees in prayer and in repentance.’ More accurate it is to say, salvation --deliverance-- is something you receive immediately when you confess with your mouth the Lord Jesus and believe in your heart that God has raised Him from the dead. Then you seek to live the rest of your life, daily, as you function in every aspect of living, ‘faithing’ in the promises of God that He will transform your soul by the renewing of your mind.
 You receive deliverance in your spirit and remain delivered in your soul (your behavior mechanism) --are transformed-- through a daily walk (which should include time on your knees and/or in quiet solitude with His Spirit sifting and cleansing your soul) in which you ‘faithe’ in His Spirit within which you received the minute you were delivered.
 You received a deliverer (soter) in your dead human spirit when you confessed Jesus Christ. You are ‘sotered’ daily, to coin a word mixing Greek and English, in your behavior mechanism, your soul.