It is by the Spirit of God that men might be called the Sons of God, and it has nothing whatsoever to do with the flesh. Christ came to many who claimed to be of the tribe of Judah, and most rejected Him. However those of the Faith did receive the new Covenant of Christ.
He came unto his own (as it were) and his own received him not. But as many as received him, to them gave he power to become the sons of God, even to them that believe on his name: Which were born, not of blood, nor of the will of the flesh, nor of the will of man, but of God (John 1:11-13).
Isaiah 59:21 As for me, this is my covenant with them, saith the LORD; My spirit that is upon thee, and my words which I have put in thy mouth, shall not depart out of thy mouth, nor out of the mouth of thy seed, nor out of the mouth of thy seed’s seed, saith the LORD, from henceforth and for ever.
Eye hath not seen, nor ear heard, neither can they have the understanding of the treasures yet to be revealed in Christ, that He has prepared for all of his children that Love His appearing. Those that walk according to the spirit of this world, are deaf blind and without any knowledge of the mysteries of Christ; these are servants of sin unto death. (1 Cor 2:7-16; Rom 6:16-23; Isa 64:4).
In Christ however we are made alive through His spirit of truth, escaping the law of sin and death. Apart from The New Covenant of Christ through Jesus, nothing else matters (2 Tim 4:8; Rom 8:2).
Prov 13:7 There is that maketh himself rich, yet hath nothing: there is that maketh himself poor, yet hath great riches.
The man that spends the majority of his time talents and treasures in and on the flesh will inherit corruption; the man that walks in and through the Spirit, will through the Spirit of Christ inherit incorruption and eternal life.
We are to seek first the Kingdom of God, and the new Covenant of Christ. The things of this world do indeed perish and are but illusions and distractions from the real treasures in Christ. When we walk in the Spirit, all of these things (Spiritual Blessings) will be added unto us (Gal 6:8; Math 6:19-20; Luke 12:21-34; Math 6:33).
2 Cor 5:17 Therefore if any man be in Christ, he is a new creature: old things are passed away; behold, all things are become new.
The new Covenant of Christ is Spiritual, and is put into our minds and written in our hearts. (Heb 8:10).
Jer 31:31 Behold, the days come, saith the LORD, that I will make a new covenant with the house of Israel, and with the house of Judah:
The new Covenant of Christ was made for the new Israel of God (Gal 6:15-16).
Jer 31:33 But this shall be the covenant that I will make with the house of Israel; After those days, saith the LORD, I will put my law in their inward parts, and write it in their hearts; and will be their God, and they shall be my people.
Mark 12:29 And Jesus answered him, The first of all the commandments is, Hear, O Israel; The Lord our God is one Lord:
The Lord made a covenant with Moses and Israel, proclaiming to them, that the Lord God was one Lord (Deut 6:4). Those that accepted the new Covenant of Christ, would be called the Israel of God. Christ confirmed the mystery of Godliness, declaring that the Lord God was one Lord when He said, “I and the Father are one.”
The imposters and liars sought to slay Christ for fulfilling the promise of the new Covenant of Christ made to Abraham, of whom they falsely claimed to be children of. Justification is for all the faithful that believe on the name of Jesus Christ, however the fire and sword of His wrath will consume the ungodly (John 10:30-32; 37-42; Gal 3:14; Isa 66:16).
Matt 22:42-45 Saying, What think ye of Christ? whose son is he? They say unto him, The Son of David. He saith unto them, How then doth David in spirit call him Lord, saying, The LORD said unto my Lord, Sit thou on my right hand, till I make thine enemies thy footstool? If David then call him Lord, how is he his son?
Heb 1:1-3 God, who at sundry times and in divers manners spake in time past unto the fathers by the prophets, Hath in these last days spoken unto us by his Son, whom he hath appointed heir of all things, by whom also he made the worlds; Who being the brightness of his glory, and the express image of his person, and upholding all things by the word of his power, when he had by himself purged our sins, sat down on the right hand of the Majesty on high;
The new Covenant of Christ, through His Spirit, is Christ’s new law put into the minds of the Elect, and written in their hearts (Heb 8:8-10; Mar 13:27). These are the Israel of God (Gal 6:16).