Paul of Tarsus

“ Don't turn away from the Good News
6 I'm astonished at how quickly you turned away from him who called you in grace, and towards another good-news 7 (not that there is another) because of certain people who are agitating you and wishing to reverse the gospel of Christ. 8 Even if we or an angel from heaven were to proclaim a different good-news than what we originally preached, let him be eternally lost. 9 As we said before, we now say again: if anyone preaches to you another gospel than what you originally accepted, let him be eternally lost. ”

“ Now, it does not say "to his seeds," as if referring to many, but was referring to his one seed, who is Christ. 17 I say to you: this contract, ratified by God, was not annulled by the law which came four hundred and thirty years later.
18 If inheritance came via the law then it no longer comes by promise; but since God gave Abraham a promise, 19 then why the law? It was added through angels, on orders of the mediator, because of sin until the coming of the seed to whom the promise was given. 20 A mediator is not for just one party, but God is one. ”

“ Burst-out in shouting, the one not suffering birth pains. Because the desolate woman has many more children than the woman with a husband." 28 Brothers, you are children of promise, like Isaac; 29 and it's like that now: the son born of flesh persecutes the one born by the Spirit.
30 What does the scripture say?
"Cast out the slave woman and her son. For the child of the slave woman will not share the inheritance of the free child." 31 Therefore, brothers, we are not children of the slave but of the free. ”

“ You might destroy one another if you bite and devour each other.
16 I say: if you are walking by the spirit there is no way you will fulfill the desires of the flesh. 17 For what the flesh desires is against the spirit, and spiritual desires are against the flesh. 18 If you are led by the spirit, you are not under the law. ”

“ Life of faith vs. life under the Law
15 We Jews-by-birth are not Gentile sinners, 16 and we know that a person is never justified by works of the law but through faith in Jesus Christ. We believed in Jesus Christ that we might be justified by faith in Christ, and not by obeying the law. My body is not justified by the law. ”

“ Fearing the circumcised ones, he separated from the Gentiles. 13 The rest of the Jews joined in this charade and even Barnabas was drawn into the hypocrisy.
14 When I saw they were not walking in the gospel truth, I said to Peter in front of the others, "You are a Jew who lives as a Gentile. How, then, can you pressure the Gentiles to live as Jews?" ”