In 1 Corinthians 15:44-47, Paul uses the Greek term psychikos, the adjectival form of the noun psyche, which is translated 'being' in verse 45 and can also be rendered 'life' or 'animated existence.' Paul's contrast between 'natural' and 'spiritual' is a contrast between that which is temporally alive and that which has an eternal existence with God (cf. 1 Corinthians 2:14-3:3). Starting from Genesis 2:7, Paul explains that God created Adam from the dust and animated him with breath. Christ, however, is the last Adam, and His resurrection gave Him a spiritual and therefore imperishable body (Phili8ppians 3:21). By 'spiritual body' Paul does not mean an immaterial body but a body ~ very material and very physical ~ animated and empowered by the Holy Spirit.In 1 Corinthians 15:44-45, Paul showed that Christ's raised body was "made a quickening spirit". Same idea appears in 1 Peter 3:18-19, because flesh could not go to the "spirits in prison", which points to the heavenly dimension.
So the word 'physical' can be misleading on this matter, because the "spiritual body" does have a physical appearance just like a flesh body, including feel and touch, but it isn't a flesh body, because like Paul also said in 1 Cor.15:50, flesh and blood cannot inherit the Kingdom of God, neither does corruption (flesh) inherit incorruption (spirit body).
Jesus is quite obviously telling Nicodemus that even in this life, one can be born of the Spirit, and thus alive spiritually, which hearkens back to God's words through the prophet Ezekiel:And in John 3, Jesus said that which is born of the flesh is flesh, and that which is born of The Spirit is spirit. Thus flesh and spirit are two separate operations and manifestations.
- "I will give them one heart, and a new spirit I will put within them. I will remove the heart of stone from their flesh and give them a heart of flesh, that they may walk in my statutes and keep my rules and obey them. And they shall be my people, and I will be their God" (11:19-20).
- "I will give you a new heart, and a new spirit I will put within you. And I will remove the heart of stone from your flesh and give you a heart of flesh. And I will put My Spirit within you, and cause you to walk in My statutes and be careful to obey My rules. You shall dwell in the land that I gave to your fathers, and you shall be My people, and I will be your God" (36:26-28).
- "And you were dead in the trespasses and sins in which you once walked, following the course of this world, following the prince of the power of the air, the spirit that is now at work in the sons of disobedience ~ among whom we all once lived in the passions of our flesh, carrying out the desires of the body and the mind, and were by nature children of wrath, like the rest of mankind. But God, being rich in mercy, because of the great love with which he loved us, even when we were dead in our trespasses, made us alive together with Christ ~ by grace you have been saved ~ and raised us up with Him and seated us with Him in the heavenly places in Christ Jesus, so that in the coming ages He might show the immeasurable riches of His grace in kindness toward us in Christ Jesus. For by grace you have been saved through faith. And this is not your own doing; it is the gift of God, not a result of works, so that no one may boast. For we are His workmanship, created in Christ Jesus for good works, which God prepared beforehand, that we should walk in them" (Ephesians 2:1-10).
- "Blessed be the God and Father of our Lord Jesus Christ! According to His great mercy, He has caused us to be born again to a living hope through the resurrection of Jesus Christ from the dead, to an inheritance that is imperishable, undefiled, and unfading, kept in heaven for you, who by God’s power are being guarded through faith for a salvation ready to be revealed in the last time" (1 Peter1:3-5).
Grace and peace to all!