For all souls are mine; as the soul of the father, so also the soul of the son, they are mine: the soul that sins, it shall die. EZEKIEL 18:4 Brenton LXX.

Let no man say when he is tempted, I am tempted of God: for God cannot be tempted with evil, neither tempteth he any man:
But every man is tempted, when he is drawn away of his own lust, and enticed.
Then when lust hath conceived, it bringeth forth sin: and sin, when it is finished, bringeth forth death. JAMES 1:13 - 15 KJV.

If we confess our sins, he is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness. 1 JOHN 1:9 KJV.

For this my son was dead, and is alive again; he was lost, and is found. And they began to be merry. LUKE 15:24 KJV.

As soon as a Christian sins, that soul dies - in less than a second it is dead.
That soul, because of the deceitfulness of sin may allow itself to become deceived into thinking it hasn't sinned and is still Right-With-God, that is, that it hasn't just died.
It takes the guilt/conviction of the Holy Spirit and the Honesty of that soul to enable that soul to Repent again.
As soon as that soul confesses their sin and Repents again they become Alive-again, instantly.
This is only possible because of Jesus' Blood which was shed for the Remission of sins.
Repenting of sin to God means, 'going and sinning no more' (see John 5:14; 8:11).
It means 'bearing fruit meet for Repentance' (see Matthew 3:8; Acts 26:20).
It means 'having your fruit unto Holiness and the end - everlasting Life' (see Romans 6:22)
It means Crucifying the flesh and walking in it no more (Gal 5:24), instead, walking in the Spirit (Rom 8:1,4; Gal 5:16).
This is the great Power of Jesus' Blood - to make Free from the Power of sin (John 8:30-36) and to enable access to the Presence of God perpetually (Rm 5:2; Eph 2:18; 3:12), by the Cross daily (Luke 9:23).
This also is the 'circumcision made without hands' (Col 2:11), the denial and killing of the 'attitude' or 'life' of the flesh (Rom 8:13; Col 3:5).
The circumcision is only performed at the will of the believer, that is, that soulmust choose itself to be circumcised by the Hearing and Obeying of Faith (Deut 10:16; 30:6; 2 Chron 30:8; Acts 7:51; Heb 3:15; 4:7).
This IS the Relationship every soul must have with God in order to have Life (Him), to Hear Him and Obey Him.
This is the essence of the New Testament: to stop sinning and turn to God for Life [Eternal], to be Led by the voice of the Holy Spirit bearing His Holy fruit in good thoughts and words and works, and to abide/remain/continue faithful in this [daily] until the end - that is - until your death or His Son's Return.