Once the call to come over to the Lord’s side through repentance and faith in Christ death is obeyed, the unsaved youth’s sins are forgiven and his spirit cleansed and from that moment he strikes a Father-son relationship with God and the holy nature of God is deposited in him.
The next thing in this ladder of holiness is to have his soul cleansed for completeness (1Thessalonians 5:23). This is done at sanctification. The very source of sin from where contaminations, ungodly desire, etc. come, is rooted up. God, by His Spirit and through faith in the blood of Jesus, purifies the saved youth from all that cause sin in his soul, spirit and body setting him apart for Himself (Isaiah 6:6-8; Romabs 15:16; Hebrews 10:10;13:12). Sanctification is Instantaneous. This is a definite instruction from the Lord and God’s standard for His children (Jeremiah 4:4; 1 Peter 1:15-16). As you realize your need for it, desire and thirst for it, sincerely pray and believe the Lord whose will it is to give it and you shall receive it (Isaiah 6:5; Matthew 5:6; Luke 11:9,10; 1 Thessalonians 5:23-24).
A youth who is sanctified is set apart for God and for His service. This quality and new experience is one of the things that qualifies him as God’s youth. For this reason, he can be likened to the Levites among children of Israel (Ezekiel 44:15,16; Numbers 3:12-13; 8:15-18); the Israelites among other nations (Exodus 19:5,6); and the Rechabites (Jeremiah 35:1-10). These were people consecrated and set apart and were therefore expected to keep and maintain the experience by putting a difference between the holy and unholy, the clean and unclean and not be defiled (cons. Leveticus 10:8-11. 11:43-47; 20:22-26). The child of God, having encountered the holiness of God at sanctification must put a difference between the holy and unholy (1 Peter 2:9) and go for the things that are expedient (1 Corinthians 6:12).