Conversion would seem to me to begin with the new birth, then as we grow in grace, and in the knowledge of our Lord and Savior Jesus Christ we show forth His image to the glory of God.
The essence of this truth comes when a person properly understands what the first aspect of death is = spiritual separation from God. God is life, God is light and God is holy. Thus spiritual separation from God who is life means a state of spiritual
death. Spiritual separation from God who is light means a state of spiritual
darkness. Spiritual separation from God who is holy means a state of spiritual
depravity. The unregenerate condition is described under these three characteristics in Ephesians 4:18-19:
18
Having the understanding darkened, being alienated from the life of God through the ignorance that is in them, because of the blindness of their heart:
19 Who being past feeling have given themselves over unto lasciviousness, to work all uncleanness with greediness.
1. God is Light - "darkened...blindness"
2. God is Life - "alienated from the life of God"
3. God is holy - "given...unto lasciviousness....all uncleanness"
The reversal of this threefold state of spiritual separation from God is spiritual union with God. Each of these three aspects of spiritual separation when reversed have a divine cause and a human consequence. The human consequence we call conversion while the divine cause, depending on which aspect is being considered has a name suited for that particular issue.
For example, let's take the spiritual separation from God as "light." The positive aspect for the reversal of spiritual darkness is described as an internal revelation of knowledge or metaphorical light. We see this in the case of Peter in Matthew 16:17 "flesh and blood hath not REVEALED this...but my Father in heaven" or in the case of Paul on the road to Damascus in Galatians 1:15-16 "revealed His son in me" or Paul's description of the gospel as empowered by God as a divine command in 2 Cor. 4:6 "For God, who commanded the light to shine out of darkness, hath shined in our hearts,
to give the light of the knowledge of the glory of God in the face of Jesus Christ." That is the positive aspect - light of knowlege" a divine revelation within the heart. The negative is that "darkness" is metaphorical of "ignorance" or a state of spiritual "blindness" Thus where God commands "light of knowledge" (positive) it is the removal of ignorance and blindness (negative). The revelation is by command of God and is a creative act as in Genesis 1:3. The experience of this creative act is one aspect of what we call conversion from darkness to light or from ignorance/blindness to understanding or knowing God through Jesus Christ. This creative act of God is the empowerment of the gospel within the heart that produces the light of knowledge or revelation of Jesus Christ (1 Thes. 1:3-4) in the heart which is the "substance" and "hope" of justifying faith. Hence, our experience of this creative act of God is saving faith. The gospel is used by God as His creative command to produce the "substance" and "hope" of Faith as well as used by God as the object of faith - thus saving faith is our experience of this internal creative act of God.
For example, lets take the spiritual separation from God as "holy." The positive aspect of the reversal of spiritual depravity is described as a metaphorical internal "washing" by the Holy Spirit, or internal cleansing from the defilement of sin (Tit. 3:5 "washing") while the positive side is a "renewing" in true holiness and righteousnes (Tit. 3:5 joined with Eph. 4:24; Col. 3:10) which again is a creative act of God as clearly stated in Ephesians 4:24 and Col. 3:10). Our experience of this creative act of God is called "repentance." Repentance is an inward change from love of sin to love of holiness but it is the creative act of God that is making this change while we are experiencing that change as repentance or turning from sin to righteousness with regard to our hearts (desire) and mind (understanding) and will (resistance to submission).
For example, lets take the spiritual separation from God as "life." The positive aspect of for the reversal of spiritual death is described as "life." Therefore, the Bible calls this creative act as being "quickened" (made alive) as contrasted with "dead" or "born again" as contrasted with the first birth and its nature or "regenerated" all of which have to do with a new life. Yet, this is interrelated to the previous aspect of spiritual darkness as Jesus says "
This is eternal life that they might
KNOW the only true God and Jesus Christ His son" (Jn. 17:3). Paul says that being "alienated from the life of God through
ignorance that is in them because of the blindness of their heart" (Eph. 4:18). The negative aspect of regeneration is removal of the root cause of ignorance which is "blindness" thus giving them eyes to see and ears to hear. However, eyes must see something and ears must hear something or there is no sight or hearing. Seeing and hearing is another metaphor for believing and it is the gospel revelation of Christ that is being seen and heard.
So the initial saving work of God that reverses spiritual separation from God as light, life and holiness is a creative act by God, and thus the cause of salvation but is inseparable from conversion as the immediate consequence of spiritual union.
So bottom line, this threefold but inseparable creative work of God produces a repentant and believing heart. It transforms the heart from blindness and darkness (unbelief) to belief and from uncleaness and love for sin (unrepentance) to repentance, and thus from death unto life. This is the change from spiritual separation to spiritual union with God.